I bought this drive because I expected it firstly to be reliable (so far it is) and secondly because I liked the idea of an automatic complete drive backup (total disaster). I loaded the software, kicked off the backup; then it got part way and hung. No matter what I tried, I couldn't get it to complete - failure one. I uninstalled and reinstalled the software, and the backup appeared to complete, but too quickly. On checking the data, the backup had only partially completed - failure two. I then tested the automatic backup of updated files, but nothing happened - failure three. I've therefore reverted to the reliable backup that Windows Vista provides - it's not automatic and can't operate more frequently than daily, but at least it does what it claims to do. I would advise anybody only to purchase this drive if they don't plan to use the backup software.