We were using Retrospect for the past couple years with a Quantum LTO 4. HORRIBLE solution and not recommended to anyone. Run fast to Tolis Group.
We switched to an LTO 5 drive with Bru software and the difference is night and day. MUCH better solution for backing up media.
I don't like bashing products, but Retrospect deserves it when they went from V6 to V8 with no compatibility between them. I have about 40 LTO tapes that now need V6 and a very specific Mac OS. So I now have to keep a bootable drive with only the Mac OS and V6 available just in case I need old footage. Very dumb on their part. I can't imagine how angry people are that have 100's of LTO tapes that can't be read by the V8 software.
Bru rocks. Love it.