If you are like every other computer user on earth and you are not backing up your PC you're asking for some serious pain. Don't think it won't happen to you? Well, it will. Not if, but when.
Anyway, one of the cheapest, easiest solutions available today is the HP SimpleSave. It really is the easiest, simplest backup device I have ever seen. And, if you get it from Amazon there's no tax and shipping is currently free. It's a no brainier, so save your data and get one below today.