At the office, your IT guys probably back up your computer for you or force you to store critical files on a file server that they back up. I'll write later about how the Institute does backup at a corporate level. The concern of this posting is backing up personal computers. What are you going to do if your hard disk starts making a funny clicking sound, then stops spinning? Or when your notebook drops out of your hands and tumbles down a flight of stairs? Or when a nearby lightning strike fries your 5 year old surge protector and everything attached to it?