Hobocopy Incorrectly Making Incremental Backups

[candera]

Background

A user reports in this thread that hobocopy is behaving incorrectly when run with the /incremental switch. He reports that only the part of the file that has changed since the last backup is getting copied to the destination directory.

Expected Behavior

• An incremental copy should copy all of any files that have changed since the last copy.

Tech Notes

It looks like the issue might be that /incremental specifies that hobocopy make a snapshot specifying VSS_BT_INCREMENTAL, which I guess actually only shadows the portion of the file that has changed. We want VSS_BT_FULL, so that the whole file gets shadowed.

[candera]

A cut at fixing this is in branch 29-always-use-full-backup.