I've been using it to clone drives for the last 3 years and within the last 2 started using it to make weekly full backups and nightly differentials to another hard drive in my system. With the black Friday's deals too good to pass up, I decided to get 2 1TB hard drives to replace my aging 250GB drives that I have setup as a raid mirror. Swapping the drives went without a hitch, but I could not find any free software to extend my RAID partition beyond the original 250GB. Since I still had the old drives in the same working order I said what the heck. I made a current differential backup, rebooted, blasted the old RAID mirror, created a new one to accommodate the 1TB drives, and booted from the Acronis CD and did a restore. Whole process took about 45 minutes and my system is exactly how it was. Couldn't be happier.