When configuring your backup policies, do not assign backup images not intended to be moved offsite to volumes in an offsite volume pool. In some circumstances, Vault ejects a volume if it contains images not intended for offsite storage. For example, if volume ABC123 has three images from policy1 and three images from policy2, and policy1 is specified on the profile Eject tab, volume ABC123 is ejected even though it contains images from policy 2.
Use different volume pools for backup images you want to keep on site and for backup images you want to send to the vault. If you use the same volume pool for both, you vault the backup images that should remain on-site. Also, if you use the same volume pool for both, a deadlock situation may result if your Vault profile is duplicating images. It may attempt to read a backup image from the same tape to which it tries to write the image.