Everything on the Backup Target happens as the user nova
NetBackup for OpenStack reads and writes on the Backup Target as nova:nova.
The POSIX user-id and group-id of nova:nova need to be aligned between the NetBackup for OpenStack Cluster and all compute nodes. Otherwise backups or restores may fail with permission or file not found issues.
Alternative ways to achieve the goal are possible, as long as all required nodes can fully write, and read as nova:nova on the Backup Target.
It is recommended to verify the required permissions on the Backup Target in case of any errors during the data transfer phase or in case of any file permission errors.