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 on 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.
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 ().