How do I do a "differential" backup?

[jordannolan]

After I do a full backup, it seems like my only option for my normal is what most backup software would consider an "incremental" backup, but that means that I have to keep hording tapes all week until I do a recycle again. That is not what I want.

 

I know how to do a full backup each weekend, but how do I get my M-Th tapes to backup everything since the last full regardless of whether or not is was on the previous nights normal backup.

 

I want to have my weekend backup on one tape and only have to carry that and one of the tapes from M-Th.

[waldorfm]

I'm not Dantz support, but I would say differential backup is a different approach to what Retrospect does, which to my knowledge matches every subsequent backup of any file to all files in a backup set to avoid multiple backups between different or same clients. I would think you could simulate a unix alike backup strategy by modifying the backup set and set those tapes, except the "base backup" to missing. A bit ugly though and I would not know how to automate this right now.