That's great advice on backup Charles! As a photographer I can not even think about data loss. I run a Mac with three hard drives so I have one drive that's strictly dedicated to backup. When I upload to my photo editing software files go to two separate drives. I even keep another backup drive in a safe deposit box just in case of major disaster. Drives are so cheap these days at least one backup drive should be used for anyone that has any kind of critical data to preserve.