I found this thread via google. I, too, am having major "error 206" troubles. I bought an Iomega REV FireWire drive recently, and it came with Retrospect Express. I downloaded the latest driver from Iomega and I checked Dantz's site for the latest version of Retrospect. I am running OS 10.3.8 on an 800 MHz iMac. I zeroed all my REV disks before using them for EasyScript backups. A lot of times, Retrospect hangs in the middle of copying files. I've had to force quit more times than I can count. Other times I'll get the dreaded error 206 message. In the four months that I've had this drive, Retrospect has probably only been able to successfully run a backup script about 4 times. That's pretty pathetic, and I'm getting really frustrated.
I've read the threads on this post, but I'm not sure what I can do with my setup. Any help would be appreciated.