I also want 2 backup copies of everything (one near-line, one off-line), which means buying 3x the disks.
I'd certainly ignore backing up DVD rips. They're huge and easily recoverable from the disc. Yeah, it'll take some time, but I can't think of a situation where you
really need to watch
Repo Man right this instant.
I'm with you on this one. The DVD
is the backup. I don't even back up my MP3s, since I can re-rip everything from CD (or re-torrent, in the case of the SXSW material). I should, come to think of it, back up the ID3 tags info, so I don't have to re-edit it all, which was the most time-consuming part of ripping them.