Export and import backup metadata
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 database used by the
Block Storage service.
For information about how to back up and restore a volume, see .
You can, however, export the metadata of a volume backup. To do so, run this command as an
OpenStack admin user (presumably, after creating a volume backup):
$ cinder backup-export BACKUP_ID
Where BACKUP_ID is the volume backup's ID. This command should
return the backup's corresponding database information as encoded string metadata.
Exporting and storing this encoded string metadata allows you to completely restore the
backup, even in the event of a catastrophic database failure. This will preclude the need to
back up the entire Block Storage database, particularly if you only need to keep complete
backups of a small subset of volumes.
If you have placed encryption on your volumes, the encryption will still be in place when
you restore the volume if a UUID encryption key is specified when creating volumes. Using
backup metadata support, UUID keys set up for a volume (or volumes) will remain valid
when you restore a backed-up volume. The restored volume will remain
encrypted, and will be accessible with your credentials.
In addition, having a volume backup and its backup metadata also provides volume
portability. Specifically, backing up a volume and exporting its metadata will allow you to
restore the volume on a completely different Block Storage database, or even on a different
cloud service. To do so, first import the backup metadata to the Block Storage database and
then restore the backup.
To import backup metadata, run the following command as an OpenStack
admin:
$ cinder backup-import METADATA
Where METADATA is the backup metadata exported earlier.
Once you have imported the backup metadata into a Block Storage database, restore the
volume ().