Roger, Not sure what that "Casper Tech edition" is, but if you go to the following link, you will find a purchase link for Casper 5.0 (I guess they no longer call it Casper XP) for $49.95. This is what you want. Also, since you will be backing up to an external USB hard drive, you should also buy the "Casper 5.0 Startup disk" which sells for $9.95. You'll need this CD to do a restore of your internal hard drive from the external backup hard drive. This item is also found on the following link: http://www.fssdev.com/shop/default.aspx#casper I have a similar hardware setup like yours. My external USB hard drive has a larger capacity. It works great; Casper has no problem creating a clone of my entire system. If you need to replace lost folders or files, all you need to do is find them on your backup drive and copy and paste them into your primary hard drive. Alan