Netbackup Catalog retention
I'm reviewing our retention periods for off-site catalog backups using Netbackup 7.5. We take tapes offsite every week and do a daily full catalog backup to tape on a one day retention. My question is, what retention period should be set for the off site catalog? If the catalog tape expires while it is off-site does that mean it would be impossible to recover it using the disaster recovery file? We aren't using vault, just standard Netbackup.
Any help on this would be great