Quote - I use Time Machine on my mac to back up things on a 2TB disk. I can go back to weekly backups as far back as about 6 months ago (it uses a trick that only adds stuff that has changed, so my 1TB disk goes a pretty long way on a 2TB backup). As a result, I don't have to worry about this. I don't know what's out there for windows folks, but there should be something similar. Carbonite's anual cost is cheaper than buying a large disk these days and should be very safe. If you go that route, you could rebuild even after a fire (once you got replacement hardware, of course).

The only thing about Time Machine that I've never liked is that everythihng is still on the same drive, so if that drive goes everything goes. On the other hand, if you have seperate drives to back up to, it's great.