diff --git a/.babelrc b/.babelrc
index aecf955..af3a860 100644
--- a/.babelrc
+++ b/.babelrc
@@ -2,5 +2,6 @@
   "presets": [
     "flow",
     "env"
-  ]
+  ],
+  "plugins": ["transform-class-properties"]
 }
diff --git a/.flowconfig b/.flowconfig
index c44fcda..3a2d2dc 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -9,5 +9,6 @@ lib/.*
 [libs]
 
 [options]
+munge_underscores=true
 
 [lints]
diff --git a/bin/firestore-backup.js b/bin/firestore-backup.js
index a894f14..b861df9 100755
--- a/bin/firestore-backup.js
+++ b/bin/firestore-backup.js
@@ -17,10 +17,18 @@ var backupPathParamDescription = 'Path to store backup.'
 var prettyPrintParamKey = 'prettyPrint'
 var prettyPrintParamDescription = 'JSON backups done with pretty-printing.'
 
+var databaseStartPathParamKey = 'databaseStartPath'
+var databaseStartPathParamDescription = 'The database collection or document path to begin backup.'
+
+var requestCountLimitParamKey = 'requestCountLimit'
+var requestCountLimitParamDescription = 'The maximum number of requests to be made in parallel.'
+
 commander.version('1.0.1')
   .option('-a, --' + accountCredentialsPathParamKey + ' <path>', accountCredentialsPathParamDescription)
   .option('-B, --' + backupPathParamKey + ' <path>', backupPathParamDescription)
   .option('-P, --' + prettyPrintParamKey, prettyPrintParamDescription)
+  .option('-S, --' + databaseStartPathParamKey + ' <path>', databaseStartPathParamDescription)
+  .option('-L, --' + requestCountLimitParamKey + ' <number>', requestCountLimitParamDescription)
   .parse(process.argv)
 
 const accountCredentialsPath = commander[accountCredentialsPathParamKey]
@@ -43,14 +51,26 @@ if (!backupPath) {
   process.exit(1)
 }
 
-const prettyPrint = commander[prettyPrintParamKey] !== undefined && commander[prettyPrintParamKey] !== null
+const prettyPrintJSON = commander[prettyPrintParamKey] !== undefined && commander[prettyPrintParamKey] !== null
+
+const databaseStartPath = (commander[databaseStartPathParamKey] || '').replace(/^\//, '')
+
+const requestCountLimit = parseInt(commander[requestCountLimitParamKey] || '1', 10)
 
 var firestoreBackup = require('../dist/index.js')
 try {
-  firestoreBackup.default(accountCredentialsPath, backupPath, prettyPrint)
-      .then(() => {
-        console.log(colors.bold(colors.green('All done 💫')))
-      })
+  console.time('backuptime')
+  firestoreBackup.default({
+    accountCredentials: accountCredentialsPath,
+    databaseStartPath,
+    backupPath,
+    prettyPrintJSON,
+    requestCountLimit
+  })
+    .then(() => {
+      console.log(colors.bold(colors.green('All done 💫')))
+      console.timeEnd('backuptime')
+    })
 } catch (error) {
   console.log(colors.red(error))
   process.exit(1)
diff --git a/dist/firestore.js b/dist/firestore.js
index 26c8894..5d7eecf 100644
--- a/dist/firestore.js
+++ b/dist/firestore.js
@@ -3,7 +3,9 @@
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
-exports.backupRootCollections = exports.backupCollection = exports.backupDocument = exports.constructDocumentValue = exports.constructReferenceUrl = undefined;
+exports.FirestoreBackup = exports.constructDocumentValue = exports.constructReferenceUrl = undefined;
+
+var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
 
 var _types = require('./types');
 
@@ -19,6 +21,8 @@ var _mkdirp2 = _interopRequireDefault(_mkdirp);
 
 function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
 
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
 function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
 
 var constructReferenceUrl = exports.constructReferenceUrl = function constructReferenceUrl(reference) {
@@ -104,68 +108,111 @@ var constructDocumentValue = exports.constructDocumentValue = function construct
   return documentDataToStore;
 };
 
-var backupDocument = exports.backupDocument = function backupDocument(document, backupPath, logPath, prettyPrintJSON) {
-  console.log('Backing up Document \'' + logPath + document.id + '\'');
-  try {
-    _mkdirp2.default.sync(backupPath);
-  } catch (error) {
-    throw new Error('Unable to create backup path for Document \'' + document.id + '\': ' + error);
-  }
+var defaultBackupOptions = {
+  databaseStartPath: '',
+  requestCountLimit: 1
+};
 
-  var fileContents = void 0;
-  try {
-    var documentData = document.data();
-    var keys = Object.keys(documentData);
-    var documentDataToStore = {};
-    documentDataToStore = Object.assign({}, constructDocumentValue(documentDataToStore, keys, documentData));
-    if (prettyPrintJSON === true) {
-      fileContents = JSON.stringify(documentDataToStore, null, 2);
-    } else {
-      fileContents = JSON.stringify(documentDataToStore);
+var FirestoreBackup = exports.FirestoreBackup = function () {
+  function FirestoreBackup(options) {
+    _classCallCheck(this, FirestoreBackup);
+
+    this.options = Object.assign({}, defaultBackupOptions, options);
+
+    if (this.options.requestCountLimit > 1) {
+      this.documentRequestLimit = 3; // 3 is the max before diminishing returns
     }
-  } catch (error) {
-    throw new Error('Unable to serialize Document \'' + document.id + '\': ' + error);
-  }
-  try {
-    _fs2.default.writeFileSync(backupPath + '/' + document.id + '.json', fileContents);
-  } catch (error) {
-    throw new Error('Unable to write Document \'' + document.id + '\': ' + error);
   }
 
-  return document.ref.getCollections().then(function (collections) {
-    return (0, _utility.promiseSerial)(collections.map(function (collection) {
-      return function () {
-        return backupCollection(collection, backupPath + '/' + collection.id, logPath + document.id + '/', prettyPrintJSON);
-      };
-    }));
-  });
-};
+  _createClass(FirestoreBackup, [{
+    key: 'backup',
+    value: function backup() {
+      var _this = this;
 
-var backupCollection = exports.backupCollection = function backupCollection(collection, backupPath, logPath, prettyPrintJSON) {
-  console.log('Backing up Collection \'' + logPath + collection.id + '\'');
-  try {
-    _mkdirp2.default.sync(backupPath);
-  } catch (error) {
-    throw new Error('Unable to create backup path for Collection \'' + collection.id + '\': ' + error);
-  }
+      if ((0, _types.isDocumentPath)(this.options.databaseStartPath)) {
+        var databaseDocument = this.options.database.doc(this.options.databaseStartPath);
+        return databaseDocument.get().then(function (document) {
+          return _this.backupDocument(document, _this.options.backupPath + '/' + document.ref.path, '/');
+        });
+      }
 
-  return collection.get().then(function (documentSnapshots) {
-    var backupFunctions = [];
-    documentSnapshots.forEach(function (document) {
-      backupFunctions.push(function () {
-        return backupDocument(document, backupPath + '/' + document.id, logPath + collection.id + '/', prettyPrintJSON);
+      if ((0, _types.isCollectionPath)(this.options.databaseStartPath)) {
+        var databaseCollection = this.options.database.collection(this.options.databaseStartPath);
+        return this.backupCollection(databaseCollection, this.options.backupPath + '/' + databaseCollection.path, '/');
+      }
+
+      return this.backupRootCollections();
+    }
+  }, {
+    key: 'backupRootCollections',
+    value: function backupRootCollections() {
+      var _this2 = this;
+
+      return this.options.database.getCollections().then(function (collections) {
+        return (0, _utility.promiseParallel)(collections, function (collection) {
+          return _this2.backupCollection(collection, _this2.options.backupPath + '/' + collection.id, '/');
+        }, 1);
       });
-    });
-    return (0, _utility.promiseSerial)(backupFunctions);
-  });
-};
+    }
+  }, {
+    key: 'backupCollection',
+    value: function backupCollection(collection, backupPath, logPath) {
+      var _this3 = this;
+
+      console.log('Backing up Collection \'' + logPath + collection.id + '\'');
+      try {
+        _mkdirp2.default.sync(backupPath);
+      } catch (error) {
+        throw new Error('Unable to create backup path for Collection \'' + collection.id + '\': ' + error);
+      }
 
-var backupRootCollections = exports.backupRootCollections = function backupRootCollections(database, backupPath, prettyPrintJSON) {
-  return database.getCollections().then(function (collections) {
-    return (0, _utility.promiseSerial)(collections.map(function (collection) {
-      return function () {
-        return backupCollection(collection, backupPath + '/' + collection.id, '/', prettyPrintJSON);
-      };
-    }));
-  });
-};
\ No newline at end of file
+      return collection.get().then(function (documentSnapshots) {
+        return documentSnapshots.docs;
+      }).then(function (docs) {
+        return (0, _utility.promiseParallel)(docs, function (document) {
+          return _this3.backupDocument(document, backupPath + '/' + document.id, logPath + collection.id + '/');
+        }, _this3.options.requestCountLimit);
+      });
+    }
+  }, {
+    key: 'backupDocument',
+    value: function backupDocument(document, backupPath, logPath) {
+      var _this4 = this;
+
+      console.log('Backing up Document \'' + logPath + document.id + '\'');
+      try {
+        _mkdirp2.default.sync(backupPath);
+      } catch (error) {
+        throw new Error('Unable to create backup path for Document \'' + document.id + '\': ' + error);
+      }
+
+      var fileContents = void 0;
+      try {
+        var documentData = document.data();
+        var keys = Object.keys(documentData);
+        var documentDataToStore = {};
+        documentDataToStore = Object.assign({}, constructDocumentValue(documentDataToStore, keys, documentData));
+        if (this.prettyPrintJSON === true) {
+          fileContents = JSON.stringify(documentDataToStore, null, 2);
+        } else {
+          fileContents = JSON.stringify(documentDataToStore);
+        }
+      } catch (error) {
+        throw new Error('Unable to serialize Document \'' + document.id + '\': ' + error);
+      }
+      try {
+        _fs2.default.writeFileSync(backupPath + '/' + document.id + '.json', fileContents);
+      } catch (error) {
+        throw new Error('Unable to write Document \'' + document.id + '\': ' + error);
+      }
+
+      return document.ref.getCollections().then(function (collections) {
+        return (0, _utility.promiseParallel)(collections, function (collection) {
+          return _this4.backupCollection(collection, backupPath + '/' + collection.id, logPath + document.id + '/');
+        }, _this4.documentRequestLimit);
+      });
+    }
+  }]);
+
+  return FirestoreBackup;
+}();
\ No newline at end of file
diff --git a/dist/firestore.js.flow b/dist/firestore.js.flow
index b8db736..853bbc3 100644
--- a/dist/firestore.js.flow
+++ b/dist/firestore.js.flow
@@ -1,8 +1,19 @@
 /* @flow */
 
-import { isString, isNull, isObject, isArray, isNumber, isDate, isBoolean, isReference } from './types'
-import type { ValueDescription, Validator } from './types'
-import { promiseSerial } from './utility'
+import {
+  isString,
+  isNull,
+  isObject,
+  isArray,
+  isNumber,
+  isDate,
+  isBoolean,
+  isReference,
+  isDocumentPath,
+  isCollectionPath
+} from './types'
+import type { ValueDescription, Validator, BackupOptions } from './types'
+import { promiseSerial, promiseParallel } from './utility'
 
 import fs from 'fs'
 import mkdirp from 'mkdirp'
@@ -30,9 +41,9 @@ export const constructReferenceUrl = (reference: Object): ValueDescription => {
 }
 
 const testValidDocumentValue = (
-    key: string,
-    documentData: Object,
-    validators: Array<Validator>) => {
+  key: string,
+  documentData: Object,
+  validators: Array<Validator>) => {
   let validValue: ?ValueDescription
 
   for (let index = 0; index < validators.length; index++) {
@@ -81,89 +92,122 @@ export const constructDocumentValue = (documentDataToStore: Object = {}, keys: A
 
       const documentValue = testValidDocumentValue(key, documentData, basicTypeValidators)
       if (documentValue) {
-        documentDataToStore = Object.assign({}, documentDataToStore, { [key]: documentValue })
+        documentDataToStore = Object.assign({}, documentDataToStore, {
+          [key]: documentValue
+        })
       } else {
         const validValue = isReference(documentData[key])
         if (validValue) {
-          documentDataToStore = Object.assign({}, documentDataToStore, { [key]: constructReferenceUrl(documentData[key]) })
+          documentDataToStore = Object.assign({}, documentDataToStore, {
+            [key]: constructReferenceUrl(documentData[key])
+          })
         } else {
           documentDataToStore = {
             value: documentData[key],
             type: 'unknown'
           }
         }
-          // TODO: stronger validation that we have a reference rather than being our fallback
+        // TODO: stronger validation that we have a reference rather than being our fallback
       }
     }
   })
   return documentDataToStore
 }
 
-export const backupDocument = (document: Object, backupPath: string, logPath: string, prettyPrintJSON: boolean) => {
-  console.log('Backing up Document \'' + logPath + document.id + '\'')
-  try {
-    mkdirp.sync(backupPath)
-  } catch (error) {
-    throw new Error('Unable to create backup path for Document \'' + document.id + '\': ' + error)
+const defaultBackupOptions = {
+  databaseStartPath: '',
+  requestCountLimit: 1
+}
+
+export class FirestoreBackup {
+  options: BackupOptions;
+
+  documentRequestLimit: number;
+
+  constructor(options: BackupOptions) {
+    this.options = Object.assign({}, defaultBackupOptions, options)
+
+    if (this.options.requestCountLimit > 1) {
+      this.documentRequestLimit = 3 // 3 is the max before diminishing returns
+    }
   }
 
-  let fileContents: string
-  try {
-    const documentData = document.data()
-    const keys = Object.keys(documentData)
-    var documentDataToStore = {}
-    documentDataToStore = Object.assign({}, constructDocumentValue(documentDataToStore, keys, documentData))
-    if (prettyPrintJSON === true) {
-      fileContents = JSON.stringify(documentDataToStore, null, 2)
-    } else {
-      fileContents = JSON.stringify(documentDataToStore)
+  backup() {
+    if (isDocumentPath(this.options.databaseStartPath)) {
+      const databaseDocument = this.options.database.doc(this.options.databaseStartPath)
+      return databaseDocument.get()
+        .then((document) => {
+          return this.backupDocument(document, this.options.backupPath + '/' + document.ref.path, '/')
+        })
+    }
+
+    if (isCollectionPath(this.options.databaseStartPath)) {
+      const databaseCollection = this.options.database.collection(this.options.databaseStartPath)
+      return this.backupCollection(databaseCollection, this.options.backupPath + '/' + databaseCollection.path, '/')
     }
-  } catch (error) {
-    throw new Error('Unable to serialize Document \'' + document.id + '\': ' + error)
+
+    return this.backupRootCollections()
   }
-  try {
-    fs.writeFileSync(backupPath + '/' + document.id + '.json', fileContents)
-  } catch (error) {
-    throw new Error('Unable to write Document \'' + document.id + '\': ' + error)
+
+  backupRootCollections() {
+    return this.options.database.getCollections()
+      .then((collections) => {
+        return promiseParallel(collections, (collection) => {
+          return this.backupCollection(collection, this.options.backupPath + '/' + collection.id, '/')
+        }, 1)
+      })
   }
 
-  return document.ref.getCollections()
-    .then((collections) => {
-      return promiseSerial(collections.map((collection) => {
-        return () => {
-          return backupCollection(collection, backupPath + '/' + collection.id, logPath + document.id + '/', prettyPrintJSON)
-        }
-      }))
-    })
-}
+  backupCollection(collection: Object, backupPath: string, logPath: string) {
+    console.log('Backing up Collection \'' + logPath + collection.id + '\'')
+    try {
+      mkdirp.sync(backupPath)
+    } catch (error) {
+      throw new Error('Unable to create backup path for Collection \'' + collection.id + '\': ' + error)
+    }
 
-export const backupCollection = (collection: Object, backupPath: string, logPath: string, prettyPrintJSON: boolean) => {
-  console.log('Backing up Collection \'' + logPath + collection.id + '\'')
-  try {
-    mkdirp.sync(backupPath)
-  } catch (error) {
-    throw new Error('Unable to create backup path for Collection \'' + collection.id + '\': ' + error)
+    return collection.get()
+      .then((documentSnapshots) => documentSnapshots.docs)
+      .then((docs) => {
+        return promiseParallel(docs, (document) => {
+          return this.backupDocument(document, backupPath + '/' + document.id, logPath + collection.id + '/')
+        }, this.options.requestCountLimit)
+      })
   }
 
-  return collection.get()
-    .then((documentSnapshots) => {
-      const backupFunctions = []
-      documentSnapshots.forEach((document) => {
-        backupFunctions.push(() => {
-          return backupDocument(document, backupPath + '/' + document.id, logPath + collection.id + '/', prettyPrintJSON)
-        })
-      })
-      return promiseSerial(backupFunctions)
-    })
-}
+  backupDocument(document: Object, backupPath: string, logPath: string) {
+    console.log('Backing up Document \'' + logPath + document.id + '\'')
+    try {
+      mkdirp.sync(backupPath)
+    } catch (error) {
+      throw new Error('Unable to create backup path for Document \'' + document.id + '\': ' + error)
+    }
 
-export const backupRootCollections = (database: Object, backupPath: string, prettyPrintJSON: boolean) => {
-  return database.getCollections()
-    .then((collections) => {
-      return promiseSerial(collections.map((collection) => {
-        return () => {
-          return backupCollection(collection, backupPath + '/' + collection.id, '/', prettyPrintJSON)
-        }
-      }))
-    })
+    let fileContents: string
+    try {
+      const documentData = document.data()
+      const keys = Object.keys(documentData)
+      var documentDataToStore = {}
+      documentDataToStore = Object.assign({}, constructDocumentValue(documentDataToStore, keys, documentData))
+      if (this.prettyPrintJSON === true) {
+        fileContents = JSON.stringify(documentDataToStore, null, 2)
+      } else {
+        fileContents = JSON.stringify(documentDataToStore)
+      }
+    } catch (error) {
+      throw new Error('Unable to serialize Document \'' + document.id + '\': ' + error)
+    }
+    try {
+      fs.writeFileSync(backupPath + '/' + document.id + '.json', fileContents)
+    } catch (error) {
+      throw new Error('Unable to write Document \'' + document.id + '\': ' + error)
+    }
+
+    return document.ref.getCollections()
+      .then((collections) => {
+        return promiseParallel(collections, (collection) => {
+          return this.backupCollection(collection, backupPath + '/' + collection.id, logPath + document.id + '/')
+        }, this.documentRequestLimit)
+      })
+  }
 }
diff --git a/dist/index.js b/dist/index.js
index 980bea3..5963da8 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -6,17 +6,19 @@ Object.defineProperty(exports, "__esModule", {
 
 var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
 
-exports.default = function (accountCredentials, backupPath, prettyPrintJSON) {
+exports.default = function (_options) {
+  var options = Object.assign({}, _options, { databaseStartPath: '' });
+
   var accountCredentialsContents = void 0;
-  if (typeof accountCredentials === 'string') {
+  if (typeof options.accountCredentials === 'string') {
     try {
-      var accountCredentialsBuffer = _fs2.default.readFileSync(accountCredentials);
+      var accountCredentialsBuffer = _fs2.default.readFileSync(options.accountCredentials);
       accountCredentialsContents = JSON.parse(accountCredentialsBuffer.toString());
     } catch (error) {
-      throw new Error('Unable to read account credential file \'' + accountCredentials + '\': ' + error);
+      throw new Error('Unable to read account credential file \'' + options.accountCredentials + '\': ' + error);
     }
-  } else if ((typeof accountCredentials === 'undefined' ? 'undefined' : _typeof(accountCredentials)) === 'object') {
-    accountCredentialsContents = accountCredentials;
+  } else if (_typeof(options.accountCredentials) === 'object') {
+    accountCredentialsContents = options.accountCredentials;
   } else {
     throw new Error('No account credentials provided');
   }
@@ -26,13 +28,14 @@ exports.default = function (accountCredentials, backupPath, prettyPrintJSON) {
   });
 
   try {
-    _mkdirp2.default.sync(backupPath);
+    _mkdirp2.default.sync(options.backupPath);
   } catch (error) {
-    throw new Error('Unable to create backup path \'' + backupPath + '\': ' + error);
+    throw new Error('Unable to create backup path \'' + options.backupPath + '\': ' + error);
   }
 
-  var database = _firebaseAdmin2.default.firestore();
-  return (0, _firestore.backupRootCollections)(database, backupPath, prettyPrintJSON);
+  options.database = _firebaseAdmin2.default.firestore();
+  var backupClient = new _firestore.FirestoreBackup(options);
+  return backupClient.backup();
 };
 
 var _firebaseAdmin = require('firebase-admin');
diff --git a/dist/index.js.flow b/dist/index.js.flow
index 77dc996..6a98343 100644
--- a/dist/index.js.flow
+++ b/dist/index.js.flow
@@ -5,19 +5,22 @@ import Firebase from 'firebase-admin'
 import fs from 'fs'
 import mkdirp from 'mkdirp'
 
-import { backupRootCollections } from './firestore'
+import { FirestoreBackup } from './firestore'
+import type { BackupOptions } from './types'
+
+export default function(_options: BackupOptions) {
+  const options = Object.assign({}, _options, {databaseStartPath: ''})
 
-export default function (accountCredentials: string | Object, backupPath: string, prettyPrintJSON: boolean) {
   let accountCredentialsContents: Object
-  if (typeof accountCredentials === 'string') {
+  if (typeof options.accountCredentials === 'string') {
     try {
-      const accountCredentialsBuffer = fs.readFileSync(accountCredentials)
+      const accountCredentialsBuffer = fs.readFileSync(options.accountCredentials)
       accountCredentialsContents = JSON.parse(accountCredentialsBuffer.toString())
     } catch (error) {
-      throw new Error('Unable to read account credential file \'' + accountCredentials + '\': ' + error)
+      throw new Error('Unable to read account credential file \'' + options.accountCredentials + '\': ' + error)
     }
-  } else if (typeof accountCredentials === 'object') {
-    accountCredentialsContents = accountCredentials
+  } else if (typeof options.accountCredentials === 'object') {
+    accountCredentialsContents = options.accountCredentials
   } else {
     throw new Error('No account credentials provided')
   }
@@ -27,11 +30,12 @@ export default function (accountCredentials: string | Object, backupPath: string
   })
 
   try {
-    mkdirp.sync(backupPath)
+    mkdirp.sync(options.backupPath)
   } catch (error) {
-    throw new Error('Unable to create backup path \'' + backupPath + '\': ' + error)
+    throw new Error('Unable to create backup path \'' + options.backupPath + '\': ' + error)
   }
 
-  const database = Firebase.firestore()
-  return backupRootCollections(database, backupPath, prettyPrintJSON)
+  options.database = Firebase.firestore()
+  const backupClient = new FirestoreBackup(options)
+  return backupClient.backup()
 }
diff --git a/dist/types.js b/dist/types.js
index d5b1c32..c85d305 100644
--- a/dist/types.js
+++ b/dist/types.js
@@ -3,9 +3,12 @@
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
+exports.isCollectionPath = exports.isDocumentPath = exports.isReference = exports.isDate = exports.isBoolean = exports.isUndefined = exports.isNull = exports.isFunction = exports.isObject = exports.isArray = exports.isNumber = exports.isString = undefined;
 
 var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
 
+var _utility = require('./utility');
+
 // Returns if a value is a string
 var isString = exports.isString = function isString(value) {
   if (typeof value === 'string' || value instanceof String) {
@@ -18,8 +21,6 @@ var isString = exports.isString = function isString(value) {
 };
 
 // Returns if a value is really a number
-
-
 var isNumber = exports.isNumber = function isNumber(value) {
   if (typeof value === 'number' && isFinite(value)) {
     return {
@@ -56,6 +57,11 @@ var isObject = exports.isObject = function isObject(value) {
   return isObjectOfType(value, Object, 'object');
 };
 
+// Returns if a value is a function
+var isFunction = exports.isFunction = function isFunction(value) {
+  return isObjectOfType(value, Function, 'function');
+};
+
 // Returns if a value is null
 var isNull = exports.isNull = function isNull(value) {
   if (value === null) {
@@ -108,4 +114,32 @@ var isReference = exports.isReference = function isReference(value) {
     };
   }
   return false;
+};
+
+/**
+ * Indicates whether this ResourcePath points to a document.
+ */
+var isDocumentPath = exports.isDocumentPath = function isDocumentPath(value) {
+  var segments = (0, _utility.getSegments)(value);
+  if (segments.length > 0 && segments.length % 2 === 0) {
+    return {
+      value: value,
+      type: 'DocumentPath'
+    };
+  }
+  return false;
+};
+
+/**
+ * Indicates whether this ResourcePath points to a collection.
+ */
+var isCollectionPath = exports.isCollectionPath = function isCollectionPath(value) {
+  var segments = (0, _utility.getSegments)(value);
+  if (segments.length % 2 === 1) {
+    return {
+      value: value,
+      type: 'CollectionPath'
+    };
+  }
+  return false;
 };
\ No newline at end of file
diff --git a/dist/types.js.flow b/dist/types.js.flow
index b30ae80..5f35f93 100644
--- a/dist/types.js.flow
+++ b/dist/types.js.flow
@@ -1,14 +1,25 @@
 /* @flow */
 
+import { getSegments } from './utility'
+
 export type ValueDescription = {
-    value: any,
-    type: string
+  value: any,
+  type: string
 }
 
 export type ValidationResult = ValueDescription | false;
 
 export type Validator = (value: any) => ValidationResult;
 
+export type BackupOptions = {|
+  accountCredentials: string | Object,
+  database: Object,
+  backupPath: string,
+  databaseStartPath: string,
+  prettyPrintJSON: boolean,
+  requestCountLimit: number
+|}
+
 // Returns if a value is a string
 export const isString = (value: any): ValidationResult => {
   if (typeof value === 'string' || value instanceof String) {
@@ -57,6 +68,11 @@ export const isObject = (value: any): ValidationResult => {
   return isObjectOfType(value, Object, 'object')
 }
 
+// Returns if a value is a function
+export const isFunction = (value: any): ValidationResult => {
+  return isObjectOfType(value, Function, 'function')
+}
+
 // Returns if a value is null
 export const isNull = (value: any): ValidationResult => {
   if (value === null) {
@@ -110,3 +126,31 @@ export const isReference = (value: any): ValidationResult => {
   }
   return false
 }
+
+/**
+ * Indicates whether this ResourcePath points to a document.
+ */
+export const isDocumentPath = (value: string): ValidationResult => {
+  const segments = getSegments(value)
+  if (segments.length > 0 && segments.length % 2 === 0) {
+    return {
+      value,
+      type: 'DocumentPath'
+    }
+  }
+  return false
+}
+
+/**
+ * Indicates whether this ResourcePath points to a collection.
+ */
+export const isCollectionPath = (value: string): ValidationResult => {
+  const segments = getSegments(value)
+  if (segments.length % 2 === 1) {
+    return {
+      value,
+      type: 'CollectionPath'
+    }
+  }
+  return false
+}
diff --git a/dist/utility.js b/dist/utility.js
index 72508a6..78f48af 100644
--- a/dist/utility.js
+++ b/dist/utility.js
@@ -1,9 +1,11 @@
-"use strict";
+'use strict';
 
 Object.defineProperty(exports, "__esModule", {
   value: true
 });
 // TODO: Flow coverage
+
+// TODO: Remove in favor of `promiseParallel`
 // from: https://hackernoon.com/functional-javascript-resolving-promises-sequentially-7aac18c4431e
 var promiseSerial = exports.promiseSerial = function promiseSerial(funcs) {
   return funcs.reduce(function (promise, func) {
@@ -13,4 +15,47 @@ var promiseSerial = exports.promiseSerial = function promiseSerial(funcs) {
       });
     });
   }, Promise.resolve([]));
+};
+
+/**
+ * Iterate over an array using the given mapper function to resolve a list of promises.
+ *
+ * @param {Array} input - The array to be mapped.
+ * @param {function:Promise} mapper - A function to be called on each array element.
+ * @param {number} [concurrency=1] - Limits the number of Promises created.
+ * @returns {Promise}
+ */
+var promiseParallel = exports.promiseParallel = function promiseParallel(input, mapper) {
+  var concurrency = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;
+
+  var results = Array.from({ length: input.length });
+  var offset = 0;
+
+  function dowork() {
+    return offset >= input.length ? Promise.resolve() : Promise.resolve(offset++).then(function (ix) {
+      return mapper(input[ix]).then(function (result) {
+        results[ix] = result;
+      });
+    }).then(function () {
+      return dowork();
+    });
+  }
+
+  return Promise.all(Array.from({ length: concurrency }, dowork)).then(function () {
+    return results;
+  });
+};
+
+/**
+ * Splits a string into path segments, using slashes as separators.
+ *
+ * @param {string} relativePath - The path to split.
+ * @returns {Array.<string>} - The split path segments.
+ */
+var getSegments = exports.getSegments = function getSegments(relativePath) {
+  // We may have an empty segment at the beginning or end if they had a
+  // leading or trailing slash (which we allow).
+  return relativePath.split('/').filter(function (segment) {
+    return segment.length > 0;
+  });
 };
\ No newline at end of file
diff --git a/dist/utility.js.flow b/dist/utility.js.flow
index 134ccd7..6e5bbd6 100644
--- a/dist/utility.js.flow
+++ b/dist/utility.js.flow
@@ -1,4 +1,6 @@
 // TODO: Flow coverage
+
+// TODO: Remove in favor of `promiseParallel`
 // from: https://hackernoon.com/functional-javascript-resolving-promises-sequentially-7aac18c4431e
 export const promiseSerial = (funcs) => {
   return funcs.reduce(
@@ -10,3 +12,39 @@ export const promiseSerial = (funcs) => {
       })
     }, Promise.resolve([]))
 }
+
+/**
+ * Iterate over an array using the given mapper function to resolve a list of promises.
+ *
+ * @param {Array} input - The array to be mapped.
+ * @param {function:Promise} mapper - A function to be called on each array element.
+ * @param {number} [concurrency=1] - Limits the number of Promises created.
+ * @returns {Promise}
+ */
+export const promiseParallel = (input, mapper, concurrency = 1) => {
+  const results = Array.from({ length: input.length })
+  let offset = 0
+
+  function dowork() {
+    return (offset >= input.length) ?
+      Promise.resolve() :
+      Promise.resolve(offset++)
+      .then(ix => mapper(input[ix]).then(result => { results[ix] = result }))
+      .then(() => dowork())
+  }
+
+  return Promise.all(Array.from({ length: concurrency }, dowork))
+    .then(() => results)
+}
+
+/**
+ * Splits a string into path segments, using slashes as separators.
+ *
+ * @param {string} relativePath - The path to split.
+ * @returns {Array.<string>} - The split path segments.
+ */
+export const getSegments = (relativePath) => {
+  // We may have an empty segment at the beginning or end if they had a
+  // leading or trailing slash (which we allow).
+  return relativePath.split('/').filter(segment => segment.length > 0)
+}
diff --git a/lib/firestore.js b/lib/firestore.js
index b8db736..424b07c 100644
--- a/lib/firestore.js
+++ b/lib/firestore.js
@@ -1,8 +1,19 @@
 /* @flow */
 
-import { isString, isNull, isObject, isArray, isNumber, isDate, isBoolean, isReference } from './types'
-import type { ValueDescription, Validator } from './types'
-import { promiseSerial } from './utility'
+import {
+  isString,
+  isNull,
+  isObject,
+  isArray,
+  isNumber,
+  isDate,
+  isBoolean,
+  isReference,
+  isDocumentPath,
+  isCollectionPath
+} from './types'
+import type { ValueDescription, Validator, BackupOptions } from './types'
+import { promiseParallel } from './utility'
 
 import fs from 'fs'
 import mkdirp from 'mkdirp'
@@ -30,9 +41,9 @@ export const constructReferenceUrl = (reference: Object): ValueDescription => {
 }
 
 const testValidDocumentValue = (
-    key: string,
-    documentData: Object,
-    validators: Array<Validator>) => {
+  key: string,
+  documentData: Object,
+  validators: Array<Validator>) => {
   let validValue: ?ValueDescription
 
   for (let index = 0; index < validators.length; index++) {
@@ -81,89 +92,122 @@ export const constructDocumentValue = (documentDataToStore: Object = {}, keys: A
 
       const documentValue = testValidDocumentValue(key, documentData, basicTypeValidators)
       if (documentValue) {
-        documentDataToStore = Object.assign({}, documentDataToStore, { [key]: documentValue })
+        documentDataToStore = Object.assign({}, documentDataToStore, {
+          [key]: documentValue
+        })
       } else {
         const validValue = isReference(documentData[key])
         if (validValue) {
-          documentDataToStore = Object.assign({}, documentDataToStore, { [key]: constructReferenceUrl(documentData[key]) })
+          documentDataToStore = Object.assign({}, documentDataToStore, {
+            [key]: constructReferenceUrl(documentData[key])
+          })
         } else {
           documentDataToStore = {
             value: documentData[key],
             type: 'unknown'
           }
         }
-          // TODO: stronger validation that we have a reference rather than being our fallback
+        // TODO: stronger validation that we have a reference rather than being our fallback
       }
     }
   })
   return documentDataToStore
 }
 
-export const backupDocument = (document: Object, backupPath: string, logPath: string, prettyPrintJSON: boolean) => {
-  console.log('Backing up Document \'' + logPath + document.id + '\'')
-  try {
-    mkdirp.sync(backupPath)
-  } catch (error) {
-    throw new Error('Unable to create backup path for Document \'' + document.id + '\': ' + error)
+const defaultBackupOptions = {
+  databaseStartPath: '',
+  requestCountLimit: 1
+}
+
+export class FirestoreBackup {
+  options: BackupOptions;
+
+  documentRequestLimit: number;
+
+  constructor(options: BackupOptions) {
+    this.options = Object.assign({}, defaultBackupOptions, options)
+
+    if (this.options.requestCountLimit > 1) {
+      this.documentRequestLimit = 3 // 3 is the max before diminishing returns
+    }
   }
 
-  let fileContents: string
-  try {
-    const documentData = document.data()
-    const keys = Object.keys(documentData)
-    var documentDataToStore = {}
-    documentDataToStore = Object.assign({}, constructDocumentValue(documentDataToStore, keys, documentData))
-    if (prettyPrintJSON === true) {
-      fileContents = JSON.stringify(documentDataToStore, null, 2)
-    } else {
-      fileContents = JSON.stringify(documentDataToStore)
+  backup() {
+    if (isDocumentPath(this.options.databaseStartPath)) {
+      const databaseDocument = this.options.database.doc(this.options.databaseStartPath)
+      return databaseDocument.get()
+        .then((document) => {
+          return this.backupDocument(document, this.options.backupPath + '/' + document.ref.path, '/')
+        })
+    }
+
+    if (isCollectionPath(this.options.databaseStartPath)) {
+      const databaseCollection = this.options.database.collection(this.options.databaseStartPath)
+      return this.backupCollection(databaseCollection, this.options.backupPath + '/' + databaseCollection.path, '/')
     }
-  } catch (error) {
-    throw new Error('Unable to serialize Document \'' + document.id + '\': ' + error)
+
+    return this.backupRootCollections()
   }
-  try {
-    fs.writeFileSync(backupPath + '/' + document.id + '.json', fileContents)
-  } catch (error) {
-    throw new Error('Unable to write Document \'' + document.id + '\': ' + error)
+
+  backupRootCollections() {
+    return this.options.database.getCollections()
+      .then((collections) => {
+        return promiseParallel(collections, (collection) => {
+          return this.backupCollection(collection, this.options.backupPath + '/' + collection.id, '/')
+        }, 1)
+      })
   }
 
-  return document.ref.getCollections()
-    .then((collections) => {
-      return promiseSerial(collections.map((collection) => {
-        return () => {
-          return backupCollection(collection, backupPath + '/' + collection.id, logPath + document.id + '/', prettyPrintJSON)
-        }
-      }))
-    })
-}
+  backupCollection(collection: Object, backupPath: string, logPath: string) {
+    console.log('Backing up Collection \'' + logPath + collection.id + '\'')
+    try {
+      mkdirp.sync(backupPath)
+    } catch (error) {
+      throw new Error('Unable to create backup path for Collection \'' + collection.id + '\': ' + error)
+    }
 
-export const backupCollection = (collection: Object, backupPath: string, logPath: string, prettyPrintJSON: boolean) => {
-  console.log('Backing up Collection \'' + logPath + collection.id + '\'')
-  try {
-    mkdirp.sync(backupPath)
-  } catch (error) {
-    throw new Error('Unable to create backup path for Collection \'' + collection.id + '\': ' + error)
+    return collection.get()
+      .then((documentSnapshots) => documentSnapshots.docs)
+      .then((docs) => {
+        return promiseParallel(docs, (document) => {
+          return this.backupDocument(document, backupPath + '/' + document.id, logPath + collection.id + '/')
+        }, this.options.requestCountLimit)
+      })
   }
 
-  return collection.get()
-    .then((documentSnapshots) => {
-      const backupFunctions = []
-      documentSnapshots.forEach((document) => {
-        backupFunctions.push(() => {
-          return backupDocument(document, backupPath + '/' + document.id, logPath + collection.id + '/', prettyPrintJSON)
-        })
-      })
-      return promiseSerial(backupFunctions)
-    })
-}
+  backupDocument(document: Object, backupPath: string, logPath: string) {
+    console.log('Backing up Document \'' + logPath + document.id + '\'')
+    try {
+      mkdirp.sync(backupPath)
+    } catch (error) {
+      throw new Error('Unable to create backup path for Document \'' + document.id + '\': ' + error)
+    }
 
-export const backupRootCollections = (database: Object, backupPath: string, prettyPrintJSON: boolean) => {
-  return database.getCollections()
-    .then((collections) => {
-      return promiseSerial(collections.map((collection) => {
-        return () => {
-          return backupCollection(collection, backupPath + '/' + collection.id, '/', prettyPrintJSON)
-        }
-      }))
-    })
+    let fileContents: string
+    try {
+      const documentData = document.data()
+      const keys = Object.keys(documentData)
+      var documentDataToStore = {}
+      documentDataToStore = Object.assign({}, constructDocumentValue(documentDataToStore, keys, documentData))
+      if (this.prettyPrintJSON === true) {
+        fileContents = JSON.stringify(documentDataToStore, null, 2)
+      } else {
+        fileContents = JSON.stringify(documentDataToStore)
+      }
+    } catch (error) {
+      throw new Error('Unable to serialize Document \'' + document.id + '\': ' + error)
+    }
+    try {
+      fs.writeFileSync(backupPath + '/' + document.id + '.json', fileContents)
+    } catch (error) {
+      throw new Error('Unable to write Document \'' + document.id + '\': ' + error)
+    }
+
+    return document.ref.getCollections()
+      .then((collections) => {
+        return promiseParallel(collections, (collection) => {
+          return this.backupCollection(collection, backupPath + '/' + collection.id, logPath + document.id + '/')
+        }, this.documentRequestLimit)
+      })
+  }
 }
diff --git a/lib/index.js b/lib/index.js
index 77dc996..6a98343 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -5,19 +5,22 @@ import Firebase from 'firebase-admin'
 import fs from 'fs'
 import mkdirp from 'mkdirp'
 
-import { backupRootCollections } from './firestore'
+import { FirestoreBackup } from './firestore'
+import type { BackupOptions } from './types'
+
+export default function(_options: BackupOptions) {
+  const options = Object.assign({}, _options, {databaseStartPath: ''})
 
-export default function (accountCredentials: string | Object, backupPath: string, prettyPrintJSON: boolean) {
   let accountCredentialsContents: Object
-  if (typeof accountCredentials === 'string') {
+  if (typeof options.accountCredentials === 'string') {
     try {
-      const accountCredentialsBuffer = fs.readFileSync(accountCredentials)
+      const accountCredentialsBuffer = fs.readFileSync(options.accountCredentials)
       accountCredentialsContents = JSON.parse(accountCredentialsBuffer.toString())
     } catch (error) {
-      throw new Error('Unable to read account credential file \'' + accountCredentials + '\': ' + error)
+      throw new Error('Unable to read account credential file \'' + options.accountCredentials + '\': ' + error)
     }
-  } else if (typeof accountCredentials === 'object') {
-    accountCredentialsContents = accountCredentials
+  } else if (typeof options.accountCredentials === 'object') {
+    accountCredentialsContents = options.accountCredentials
   } else {
     throw new Error('No account credentials provided')
   }
@@ -27,11 +30,12 @@ export default function (accountCredentials: string | Object, backupPath: string
   })
 
   try {
-    mkdirp.sync(backupPath)
+    mkdirp.sync(options.backupPath)
   } catch (error) {
-    throw new Error('Unable to create backup path \'' + backupPath + '\': ' + error)
+    throw new Error('Unable to create backup path \'' + options.backupPath + '\': ' + error)
   }
 
-  const database = Firebase.firestore()
-  return backupRootCollections(database, backupPath, prettyPrintJSON)
+  options.database = Firebase.firestore()
+  const backupClient = new FirestoreBackup(options)
+  return backupClient.backup()
 }
diff --git a/lib/types.js b/lib/types.js
index b30ae80..5f35f93 100644
--- a/lib/types.js
+++ b/lib/types.js
@@ -1,14 +1,25 @@
 /* @flow */
 
+import { getSegments } from './utility'
+
 export type ValueDescription = {
-    value: any,
-    type: string
+  value: any,
+  type: string
 }
 
 export type ValidationResult = ValueDescription | false;
 
 export type Validator = (value: any) => ValidationResult;
 
+export type BackupOptions = {|
+  accountCredentials: string | Object,
+  database: Object,
+  backupPath: string,
+  databaseStartPath: string,
+  prettyPrintJSON: boolean,
+  requestCountLimit: number
+|}
+
 // Returns if a value is a string
 export const isString = (value: any): ValidationResult => {
   if (typeof value === 'string' || value instanceof String) {
@@ -57,6 +68,11 @@ export const isObject = (value: any): ValidationResult => {
   return isObjectOfType(value, Object, 'object')
 }
 
+// Returns if a value is a function
+export const isFunction = (value: any): ValidationResult => {
+  return isObjectOfType(value, Function, 'function')
+}
+
 // Returns if a value is null
 export const isNull = (value: any): ValidationResult => {
   if (value === null) {
@@ -110,3 +126,31 @@ export const isReference = (value: any): ValidationResult => {
   }
   return false
 }
+
+/**
+ * Indicates whether this ResourcePath points to a document.
+ */
+export const isDocumentPath = (value: string): ValidationResult => {
+  const segments = getSegments(value)
+  if (segments.length > 0 && segments.length % 2 === 0) {
+    return {
+      value,
+      type: 'DocumentPath'
+    }
+  }
+  return false
+}
+
+/**
+ * Indicates whether this ResourcePath points to a collection.
+ */
+export const isCollectionPath = (value: string): ValidationResult => {
+  const segments = getSegments(value)
+  if (segments.length % 2 === 1) {
+    return {
+      value,
+      type: 'CollectionPath'
+    }
+  }
+  return false
+}
diff --git a/lib/utility.js b/lib/utility.js
index 134ccd7..7bee5f2 100644
--- a/lib/utility.js
+++ b/lib/utility.js
@@ -1,4 +1,6 @@
 // TODO: Flow coverage
+
+// TODO: Remove in favor of `promiseParallel`
 // from: https://hackernoon.com/functional-javascript-resolving-promises-sequentially-7aac18c4431e
 export const promiseSerial = (funcs) => {
   return funcs.reduce(
@@ -10,3 +12,39 @@ export const promiseSerial = (funcs) => {
       })
     }, Promise.resolve([]))
 }
+
+/**
+ * Iterate over an array using the given mapper function to resolve a list of promises.
+ *
+ * @param {Array} input - The array to be mapped.
+ * @param {function:Promise} mapper - A function to be called on each array element.
+ * @param {number} [concurrency=1] - Limits the number of Promises created.
+ * @returns {Promise}
+ */
+export const promiseParallel = (input, mapper, concurrency = 1) => {
+  const results = Array.from({ length: input.length })
+  let offset = 0
+
+  function dowork() {
+    return (offset >= input.length)
+      ? Promise.resolve()
+      : Promise.resolve(offset++)
+        .then(ix => mapper(input[ix]).then(result => { results[ix] = result }))
+        .then(() => dowork())
+  }
+
+  return Promise.all(Array.from({ length: concurrency }, dowork))
+    .then(() => results)
+}
+
+/**
+ * Splits a string into path segments, using slashes as separators.
+ *
+ * @param {string} relativePath - The path to split.
+ * @returns {Array.<string>} - The split path segments.
+ */
+export const getSegments = (relativePath) => {
+  // We may have an empty segment at the beginning or end if they had a
+  // leading or trailing slash (which we allow).
+  return relativePath.split('/').filter(segment => segment.length > 0)
+}
diff --git a/package-lock.json b/package-lock.json
index 828ed1d..97b389e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,31 +1,34 @@
 {
   "name": "firestore-backup",
-  "version": "1.2.0",
+  "version": "2.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
     "@firebase/app": {
-      "version": "0.1.6",
-      "resolved": "https://registry.npmjs.org/@firebase/app/-/app-0.1.6.tgz",
-      "integrity": "sha512-zvA+Tsc6lmuMYmDYsgoXpmPzzLLhdeH97/UVN79YGlFqCihrYAaKUi1/osoAhjXPZaV1+TXoqiSEB2vWHU7Puw==",
+      "version": "0.1.10",
+      "resolved": "https://registry.npmjs.org/@firebase/app/-/app-0.1.10.tgz",
+      "integrity": "sha512-2GTXt3b2QZXkmx6/5nNJq+pEN/VTjAG55MFJS1WMoLVZkwKuNpWNk65QVyPaoL88x1iHtuLqAMFgJUOnhOg+Pw==",
       "requires": {
-        "@firebase/app-types": "0.1.1",
-        "@firebase/util": "0.1.6"
+        "@firebase/app-types": "0.1.2",
+        "@firebase/util": "0.1.10",
+        "tslib": "1.9.0"
       }
     },
     "@firebase/app-types": {
-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/@firebase/app-types/-/app-types-0.1.1.tgz",
-      "integrity": "sha512-0CmY/orojHIJiTyDXUqrAtCSmk2nWw7h7qamJUPcBRgAIfc3ZsjFBLo1zj0sRVzZYbTWS9cKBC8tnpFZlEMLPw=="
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/@firebase/app-types/-/app-types-0.1.2.tgz",
+      "integrity": "sha512-bCIZGeMtP0ibrXNNaU214/1tRNw0jHnir/cfiAao1gjUyIS7RzOTQoH+zbwPJNEwUqJ0T3ykw/Tv4/khGqbVBg=="
     },
     "@firebase/database": {
-      "version": "0.1.7",
-      "resolved": "https://registry.npmjs.org/@firebase/database/-/database-0.1.7.tgz",
-      "integrity": "sha512-he63TYGm1IynaaavMEguglgc6o0dhJoBQ9otNM7CIIUadhYbLZU8QZ9gmFhnYj77Qck1H5cJAwTdnZXoIMK6Iw==",
-      "requires": {
-        "@firebase/database-types": "0.1.1",
-        "@firebase/util": "0.1.6",
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@@ -5639,14 +7257,6 @@
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@@ -5662,6 +7272,24 @@
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       }
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+      "resolved": "https://registry.npmjs.org/stringifier/-/stringifier-1.3.0.tgz",
+      "integrity": "sha1-3vGDQvaTPbDy2/yaoCF1tEjBeVk=",
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+        "traverse": "0.6.6",
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@@ -5718,7 +7346,7 @@
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         "chalk": "1.1.3",
-        "lodash": "4.17.4",
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@@ -5783,7 +7411,7 @@
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-        "readable-stream": "2.3.3",
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@@ -5792,19 +7420,67 @@
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       "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc="
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+      "requires": {
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+      "integrity": "sha512-FWtleNAtZ/Ki2qtqej2CXTOayOH9bHDQF+Q48VpWyDXjbYxA4Yz8iDB31zXOBUlOHHKidDbqGVrTUvQMPmBGBw==",
+      "requires": {
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+        "extend-shallow": "3.0.2",
+        "regex-not": "1.0.2",
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-      "integrity": "sha1-C2GKVWW23qkL80JdBNVe3EdadWE=",
+      "version": "2.3.4",
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       "requires": {
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       }
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+      "resolved": "https://registry.npmjs.org/traverse/-/traverse-0.6.6.tgz",
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       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM="
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+    "tslib": {
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+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.0.tgz",
+      "integrity": "sha512-f/qGG2tUkrISBlQZEjEqoZ3B2+npJjIf04H1wuAv9iA8i04Icp+61KRXxFdha22670NJopsZCIjhC3SnjPRKrQ=="
+    },
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       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -5828,11 +7504,48 @@
         "prelude-ls": "1.1.2"
       }
     },
+    "type-name": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/type-name/-/type-name-2.0.2.tgz",
+      "integrity": "sha1-7+fUEj2KxSr/9/QMfk3sUmYAj7Q="
+    },
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       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
     },
+    "union-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
+      "integrity": "sha1-XHHDTLW61dzr4+oM0IIHulqhrqQ=",
+      "requires": {
+        "arr-union": "3.1.0",
+        "get-value": "2.0.6",
+        "is-extendable": "0.1.1",
+        "set-value": "0.4.3"
+      },
+      "dependencies": {
+        "extend-shallow": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
+          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
+          "requires": {
+            "is-extendable": "0.1.1"
+          }
+        },
+        "set-value": {
+          "version": "0.4.3",
+          "resolved": "https://registry.npmjs.org/set-value/-/set-value-0.4.3.tgz",
+          "integrity": "sha1-fbCPnT0i3H945Trzw79GZuzfzPE=",
+          "requires": {
+            "extend-shallow": "2.0.1",
+            "is-extendable": "0.1.1",
+            "is-plain-object": "2.0.4",
+            "to-object-path": "0.3.0"
+          }
+        }
+      }
+    },
     "uniq": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/uniq/-/uniq-1.0.1.tgz",
@@ -5847,12 +7560,150 @@
         "crypto-random-string": "1.0.0"
       }
     },
+    "universal-deep-strict-equal": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/universal-deep-strict-equal/-/universal-deep-strict-equal-1.2.2.tgz",
+      "integrity": "sha1-DaSsL3PP95JMgfpN4BjKViyisKc=",
+      "requires": {
+        "array-filter": "1.0.0",
+        "indexof": "0.0.1",
+        "object-keys": "1.0.11"
+      }
+    },
     "universalify": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.1.tgz",
       "integrity": "sha1-+nG63UQ3r0wUiEHjs7Fl+enlkLc=",
       "dev": true
     },
+    "unset-value": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+      "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
+      "requires": {
+        "has-value": "0.3.1",
+        "isobject": "3.0.1"
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+          "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
+          "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
+          "requires": {
+            "get-value": "2.0.6",
+            "has-values": "0.1.4",
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+          },
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+              "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
+              "integrity": "sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=",
+              "requires": {
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+              }
+            }
+          }
+        },
+        "has-values": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E="
+        },
+        "isobject": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8="
+        }
+      }
+    },
+    "upath": {
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+      "resolved": "https://registry.npmjs.org/upath/-/upath-1.0.4.tgz",
+      "integrity": "sha512-d4SJySNBXDaQp+DPrziv3xGS6w3d2Xt69FijJr86zMPBy23JEloMCEOUBBzuN7xCtjLCnmB9tI/z7SBCahHBOw==",
+      "dev": true
+    },
+    "urix": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI="
+    },
+    "use": {
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+      "resolved": "https://registry.npmjs.org/use/-/use-2.0.2.tgz",
+      "integrity": "sha1-riig1y+TvyJCKhii43mZMRLeyOg=",
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+        "isobject": "3.0.1",
+        "lazy-cache": "2.0.2"
+      },
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+          "resolved": "https://registry.npmjs.org/define-property/-/define-property-0.2.5.tgz",
+          "integrity": "sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY=",
+          "requires": {
+            "is-descriptor": "0.1.6"
+          }
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+        "is-accessor-descriptor": {
+          "version": "0.1.6",
+          "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-0.1.6.tgz",
+          "integrity": "sha1-qeEss66Nh2cn7u84Q/igiXtcmNY=",
+          "requires": {
+            "kind-of": "3.2.2"
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+              "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+              "requires": {
+                "is-buffer": "1.1.6"
+              }
+            }
+          }
+        },
+        "is-data-descriptor": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz",
+          "integrity": "sha1-C17mSDiOLIYCgueT8YVv7D8wG1Y=",
+          "requires": {
+            "kind-of": "3.2.2"
+          },
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+            "kind-of": {
+              "version": "3.2.2",
+              "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-3.2.2.tgz",
+              "integrity": "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ=",
+              "requires": {
+                "is-buffer": "1.1.6"
+              }
+            }
+          }
+        },
+        "is-descriptor": {
+          "version": "0.1.6",
+          "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-0.1.6.tgz",
+          "integrity": "sha512-avDYr0SB3DwO9zsMov0gKCESFYqCnE4hq/4z3TdUlukEy5t9C0YRq7HLrsN52NAcqXKaepeCD0n+B0arnVG3Hg==",
+          "requires": {
+            "is-accessor-descriptor": "0.1.6",
+            "is-data-descriptor": "0.1.4",
+            "kind-of": "5.1.0"
+          }
+        },
+        "isobject": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/isobject/-/isobject-3.0.1.tgz",
+          "integrity": "sha1-TkMekrEalzFjaqH5yNHMvP2reN8="
+        },
+        "kind-of": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-5.1.0.tgz",
+          "integrity": "sha512-NGEErnH6F2vUuXDh+OlbcKW7/wOcfdRHaZ7VWtqCztfHri/++YKmP51OdWeGPuqCOba6kk2OTe5d02VmTB80Pw=="
+        }
+      }
+    },
     "user-home": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/user-home/-/user-home-1.1.1.tgz",
@@ -5864,9 +7715,9 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "uuid": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.1.0.tgz",
-      "integrity": "sha512-DIWtzUkw04M4k3bf1IcpS2tngXEL26YUD2M0tMDUpnUrz2hgzUBlD55a4FjdLGPvfHxS6uluGWvaVEqgBcVa+g=="
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.2.1.tgz",
+      "integrity": "sha512-jZnMwlb9Iku/O3smGWvZhauCf6cvvpKi4BKRiliS3cxnI+Gz9j5MEpTz2UFuXiKPJocb7gnsLHwiS05ige5BEA=="
     },
     "v8flags": {
       "version": "2.1.1",
@@ -5876,16 +7727,6 @@
         "user-home": "1.1.1"
       }
     },
-    "validate-npm-package-license": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz",
-      "integrity": "sha1-KAS6vnEq0zeUWaz74kdGqywwP7w=",
-      "dev": true,
-      "requires": {
-        "spdx-correct": "1.0.2",
-        "spdx-expression-parse": "1.0.4"
-      }
-    },
     "verror": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
@@ -5901,7 +7742,7 @@
       "resolved": "https://registry.npmjs.org/websocket-driver/-/websocket-driver-0.7.0.tgz",
       "integrity": "sha1-DK+dLXVdk67gSdS90NP+LMoqJOs=",
       "requires": {
-        "http-parser-js": "0.4.9",
+        "http-parser-js": "0.4.11",
         "websocket-extensions": "0.1.3"
       }
     },
@@ -5987,8 +7828,7 @@
     "yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
-      "dev": true
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI="
     },
     "yargs": {
       "version": "3.32.0",
@@ -6005,9 +7845,9 @@
       }
     },
     "yargs-parser": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-7.0.0.tgz",
-      "integrity": "sha1-jQrELxbqVd69MyyvTEA4s+P139k=",
+      "version": "9.0.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-9.0.2.tgz",
+      "integrity": "sha1-nM9qQ0YP5O1Aqbto9I1DuKaMwHc=",
       "dev": true,
       "requires": {
         "camelcase": "4.1.0"
diff --git a/package.json b/package.json
index 3a9f078..4399c78 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,8 @@
   "main": "./dist/index.js",
   "scripts": {
     "bin": "./bin/firestore-backup.js",
+    "test": "rm -rf ./backup && ./bin/firestore-backup.js --accountCredentials $GOOGLE_APPLICATION_CREDENTIALS --backupPath ./backup --prettyPrint --requestCountLimit 20",
+    "pretest": "npm run build",
     "clean": "rm -rf dist && mkdir dist",
     "buildSource": "babel lib --out-dir dist",
     "buildFlow": "flow-copy-source lib dist",
@@ -34,6 +36,7 @@
   },
   "devDependencies": {
     "babel-eslint": "7",
+    "babel-plugin-transform-class-properties": "^6.24.1",
     "eslint": "3.x",
     "eslint-plugin-flowtype": "^2.39.1",
     "flow-bin": "^0.61.0",
diff --git a/test-results.md b/test-results.md
new file mode 100644
index 0000000..cf637d6
--- /dev/null
+++ b/test-results.md
@@ -0,0 +1,17 @@
+test set of:
+  * 2 root collections containing 8 "level0" documents each
+  * each "level0" document has between 3 and 4 subcollections itself
+  * each subcollection contains a varying amount of "level1" documents ranging from 0 to 12,000
+
+`backupDocument` with a concurrency of:
+  * 1 - backuptime: 479421.435 ms = ~8 mins
+  * 3 - backuptime: 232267.139 ms = ~3.8 mins
+    * ~48% reduction of time
+    * **diminishing return tipping point**
+  * 20 - backuptime: 238634.216 ms = ~3.9 mins
+
+`backupDocument` with a concurrency of 3 and `backupCollection` with a concurrency of:
+  * 3 - backuptime: 87571.663 ms = ~1.4 mins
+    * ~81% reduction of time
+  * 20 - backuptime: 28476.332 ms = ~0.4 mins
+    * ~95% reduction of time