Backup SSTables from attached EBS volumes

[pedro-gordo]

Is your feature request related to a problem? Please describe.
Looking at Priam's feature page, it says:

Backup SSTables from local ephemeral disks to S3.

So I assume that it's not compatible with EBS volumes. EBS volumes are also quite common nowadays in Cassandra clusters. It would be great if Priam is compatible with this kind of setup as well.

Describe the solution you'd like
Being able to backup SSTables from EBS volumes, in the same way that Priam backups ephemeral storage.