My Desktop really just has Software on it too. My Email program and Data is on a Portable HD so I can bring it with me and plug into my Laptop when I'm away.
When I first set it up I had a Full Backup with only (unlimited) weekly Differentials after that to a 4T NAS. Somewhere along the line it stopped making Backups, It wasn't Full ...
After more reading last nite I figured my Desktop C Drive (plus Portable HD)) is ok with a weekly incremental and a new Full Backup after 5 or 6 Incrementals.
I also set up a Daily Differential Backup on several Key Folders on my Portable HD and a new Full of those after 5 or 6 Backups. I did Differential because I was reading it would be easier to Recover or Roll Back to a previous state, and that a corrupted Incremental file could mean Recovery to some points might not be possible.
I'll be keeping an eye on it to make sure it's doing what I think.
Does this all sound right?