Support storing backups in multiple stores #44
Description
It can be currently achieved by having separate backups handled through separate BackupStorageVMs. But it is not so convenient.
- Should we use one BackupStorageVM, or multiple BackupStorageVMs?
- Consider Tahoe-LAFS. I don't know how much is it suitable.
Related issue in another project: duplicati/duplicati#1265, duplicati/duplicati#479