Currently a volume backup can only be restored on the same Block
Storage service. This is because restoring a volume from a backup
requires metadata available on the remote database.
This proposal is to store backup metadata together
with the data, so a user will be able to restore a volume backup
on another Block Storage.
Change-Id: Ibafe96a3d1dcee8b6f28dac2f18814d3b7fcd9ef
Implements: blueprint support-backup-import-on-another-storage-database
4380a03f57