Hi Chris
A lot depends on your clients type of project and workflow - with film and animation projects there is less likely to be original media to go back to.
We have used the Superloader3 SCSI LTO3 with a couple of broadcast clients, it's not the most sophisticated tape library but does the job at a low price. We've seen some rather slow backup speeds from it, but the SAS LTO4 version should be a lot faster - see if you can get any real world performance data.
One of our clients used a Dell/IBM FC LTO4 library on a recent animation feature with excellent results - around 300GB/hr
BruPE is designed for for creating archives of media projects so doesn't have all the functionality of a network backup program like Bru Server. Should be a good tool in the right environment though.
Take a look at Archiware PreStore
http://archiware.com if you are looking for network backup & archive, we've used it with good results
Dave Barnard
cinedigital
London, UK