After a volume is assigned to an offsite volume pool, it remains in that pool and is used for rotation within that same pool (unless a scratch pool exists, in which case it is returned to the scratch pool).
To create a volume pool
This step applies to NetBackup Enterprise Server only. To allow only a specific host to use the volumes in this pool, do the following:
Symantec recommends that you do not specify a specific host. Allowing any host (the default) is recommended and is required if you have NetBackup media servers (or SAN media servers) controlled by a master server. Never specify the name of a client.
Select the Catalog backup pool check box if you plan to use this volume pool to back up the NetBackup catalog. This check box creates a dedicated catalog backup pool to be used for catalog policies. A dedicated catalog volume pool reduces the number of tapes needed during catalog restores since catalog backup media are not mixed with other backup media.