Do you back up?

I had a fatal crash on my computer about 3 years ago and I hadn't backed anything up at all. I lost all my writing, all my photographs, my address book and it was beyond recovery. I vowed then to back up regularly using in those days, a CD re-writer.

Now though, I have got an external hard drive called ClickFree, that I saw on the shopping channel. All I need to do is to plug it in to the USB port and it just backs up all my files without me having to go and look for them. It takes about 5 minutes a day after an initial full back up that took about half-an-hour.

Do you back up? Have you any horror stories to tell about losing files?