External USB and/or Firewire drives are so cheap these days. A complete computer idiot can clone their hard drive and leave that in a safe place.
I'm on the road weekly. My laptop and a recently cloned drive (which is bootable if my internal drive crashes) travel with me. Before I leave each week, the laptop data files are backed up to ANOTHER shared drive on my home workstation. That drive is mirrored and gets duplicated nightly. If my house burns down, I have DVD backups of the most pertinent data (financial and family pics/movies) in the safe deposit box kept up to date about once per month.
Sheesh. I thought everyone did it this way. 🙂
There are 2 types of computer users in this world...those who have lost data, and those who will. I fall into the latter, which is why I've become so anal about it.