I removed the system state from the items to backup and backup time went from 8+ hours to less than 1.5 hours, with only 2 GB less data backed up. Of course I don't have a system state backup now. this needs to be fixed.
Windows Server 2008 R2 with BE 2010 R2, good transfer speeds before adding Service Pack 1. Used to run 1.5 hours on BU now nearly 8 hours.
Error 8220 in application log:
Log Name: Application
Date: 3/4/2011 11:45:27...