In that case, I'd highly recommend an imaging program, like Acronis TrueImage, Norton Ghost, or Powerquest (now Norton, also) DriveImage. These will allow you to make a full backup of your drive while everything is working well and restore the exact image if the unthinkable should occur.
It is well worth the money. I use Acronis and it takes around 20 mins. for me to image my first drive on to the second while the OS is still running. It takes longer and a few CD-RW's to back up that way, but that gives you a backup that is "off-site", so to speak, if the whole computer were to go kaplooey.