I've been working with and designing backup tape hardware and software since 1984. If you have questions about backup tape technology, I can probably provide an answer or can at least point you to the best resource to find one. From old (ancient ?) QIC, DLT, or MLR/SLR to the latest DAT, LTO, AIT or SDLT, I've either worked with the design team, or with the physical devices. I currently deal with Mac OS X, all of the Unix variants, and Windows platforms.
While I work for a backup software company, I promise to keep my answers non-software product specific as I try and stay on top of the posts here.
Please don't hesitate to ask questions about backup tape hardware.