We have an xserve and xraid here with about 1tb of student work on that needs backing up on a daily basis. I have been looking at solutions and the best so far looks like the Exabyte 221L LTO:
http://www.exabyte.com/products/products/get_products.cfm?prod_id=30&product=221L
and bru for the software side.
What do you think, or can you ofer any other ideas?