Dad has been having problems with his computer. I'm backing up his data so I can install Windows again. Surprisingly, there's not a lot of work involved. He has his MP3 collection (2-3 GB worth), his Quicken data, and lots of photos. Mom and Dad only use a few programs, so it's easy to track everything down.
My stuff is pretty easy to burn off, too. I don't keep a lot of files on his computer -- mostly music and assorted documents -- but I keep it all in my folder. I think I can have everything off in five or six data CDs.