backing up

So now that I have a large-ish external hard drive (long story short: I bought one, the enclosure died on me, and then I had an adventure buying a new one in Beijing), I finally decided to try out the new Time Machine feature in 10.5. I have to admit, it's pretty slick. It always used to be such a chore to back up, and now all I have to do is plug in the hard drive and off it goes. I think it might have actually decreased my productivity, it's kind of amusing going in and seeing old versions of my hard disk.