Back up

I hope everyone who writes does a daily back up of their work onto a mini or flash drive. I do.  I used to use floppies and then CDs and now I use a  mini.  Each day's work I back up on the mini and then carry it with me in my purse. I have one mini that has all my books on it.  Also I back up all my files on my computer on a DVD once a month.  If you are serious about your work, you would never have it only on your computer. What if it crashes or gets a virus?  What if the house burns down while you're away? Where would you be then?