Let volume backup admins manage only backups
Allow backup admins to manage only backups.
Type of access: Ability to do all things with volume backups, but not create and manage volumes themselves. This makes sense if you want to have a single set of volume backup admins manage all the volume backups in all the compartments. The first statement gives the required access to the volume that is being backed up; the second statement enables creation of the backup (and the ability to delete backups). The third statement enables the creation and management of user defined backup policies; the fourth statement enables assignment and removal of assignment of backup policies.
Where to create the policy: In the tenancy, so that the access is easily granted to all compartments by way of policy inheritance. To reduce the scope of access to just the volumes and backups in a particular compartment, specify that compartment instead of the tenancy.
Allow group VolumeBackupAdmins to use volumes in tenancy
Allow group VolumeBackupAdmins to manage volume-backups in tenancy
Allow group VolumeBackupAdmins to manage backup-policies in tenancy
Allow group VolumeBackupAdmins to manage backup-policy-assignments in tenancy
If the group will be using the Console, the following policy gives a better user experience:
Allow group VolumeBackupAdmins to use volumes in tenancy
Allow group VolumeBackupAdmins to manage volume-backups in tenancy
Allow group VolumeBackupAdmins to inspect volume-attachments in tenancy
Allow group VolumeBackupAdmins to inspect instances in tenancy
Allow group VolumeBackupAdmins to manage backup-policies in tenancy
Allow group VolumeBackupAdmins to manage backup-policy-assignments in tenancy
The last two statements are not necessary in order to manage volume backups. However, they enable the Console to display all the information about a particular volume and the available backup policies.