First, the media doesn't need to be cataloged... when the backup job runs, the catalogs are created and stored on the hard drive. If I understand correctly, you have a policy with weekly full and daily incremental backups. When you add a duplicate template to this policy, if the duplicate job runs less frequently then the template it duplicates, it will include data backed up since the last duplicate job...Not sure why it isn't working unless something is overwriting media used in your incrementals or full. What you trying to accomplish sounds more suited to a Synthetic Full backup if you are trying to get standalone 'Full' backups duplicated from your full/incrementals at different times of the week. With this scenario, you only run a single full backup then as you do incrementals, you combine the incrementals and the original full to create a new full backup. You can do the original full and incrementals to disk then do the synthetic fulls to tape.