You should determine whether you want your Vault reports to group media by robot, by vault, or by profile. Your decision affects how you use your volume groups and volume pools.

Vault searches the offsite volume group for the media to include in the reports. It also uses the offsite volume pools for the same purpose. Therefore, you can use either the offsite volume group or the offsite volume pool(s) to organize media for each robot, vault, or profile.