Currently it's on RAID boxes, but I'll move to CephFS soon. The data volume is getting too big to copy it around. Ceph allows you to nicely expand your storage over time and account for some failures on the way.
Borg needs a "smart" backend with a filesystem, so it can't use only object-storage.
Borg needs a "smart" backend with a filesystem, so it can't use only object-storage.