Alright, got a strange issue with Toucan. I plopped it on my domain controller, a Server 2003 box, and set it to run as a task, as administrator, and backup a second hard-drive in the system to an external HDD after hours when nothing is in use. I chose differential and it seems to work, but the problem occurs down the road. What I noticed is that the base file is created and works (will open in 7-Zip), and the first differential file works, but the third backup and beyond do NOT work. For example, I create a new base file every Sunday. This file works. Monday it creates a differential file. This file works. Tuesday it creates another differential file, and this won't open at all. Not only that, but upon logging into the server, I get the crash dialog stating that Toucan.exe has had to close. No idea why this happens, but it has something to do with the third backup. Every time like clock-work it fails on the third backup day. What's possibly wrong here?