Cinder backup/restore over AZ is possible by storing object storage like following.

How can I backup/restore(or move) Cinder volume(which is stored in object storage by cinder-backup command) OVER REGION?

This is sample of backup/restore over AZ.

Cinder AZ

# cinder availability-zone-list
+-------+-----------+
|  Name |   Status  |
+-------+-----------+
|  nova | available |
| nova2 | available |
+-------+-----------+

In AZ1(nova), Cinder backup to object storage

# cinder backup-create --display-name <display name> <volume name>
# cinder backup-list

In AZ2(nova2), Create new volume

# cinder create --display-name <new volume name> --availability-zone nova2 1

In AZ2(nova2), Restore

# cinder backup-restore --volume-id <new volume uuid> <backup volume uuid>

Thank you.