I have a bunch of FireWire drives.
I rotate them and sometimes give one of them to someone else so that I have some backups someplace besides my house in case something really bad happens like a meteorite falls on my house or something.
One of my accounts, a small design firm, got robbed and besides stealing all their Macs they stole the backup drives. Needless to say they were really fucked.
I have way too much stuff to backup to CDs or DVDs these days. Anyway FireWire drives have gotten really cheap.