The Mapower MAP-OT21 2.5 Inch eSATA / USB Enclosure features a one touch backup button that works through software found on the included CD. The "PCClone EX Lite" software doesn't do anything fancy like some other backup software I have used, but the simplicity is a strong point. The whole thing occupies less than 11MB on disk, and it allows you to easily setup your profile of what you would like backed up.