We have 2 Iomega Rev drives - a 35GB and a 120 GB. Both are USB 2 connected to a windows 2003 standard server r2 sp2.
Backup exec 12 is our backup program. The transmission rate to the Iomega varies from 29 MB/min to 60 MB/min. It doesn't matter if it is a full backup, incremental, an ad hoc document directory, etc. It is slow. Occasionally, it will fun 350 MB/Min - something around there is about what I expect.
How can we increase our speed - our full backup is taking 8-10 hours sometimes, then on a good dat 2.5 hours (fast transfer speed).