We are looking to change our backups to a disk based deduplication solution, and 2 of our options are to utilize NetBackup 7.0’s built in dedupe (Client and Media server) or to put a Data Domain box in.  I wanted to see if I could get some real world feedback on what you guys have been seeing in terms of dedupe rates, performance, etc.  For example Data Domain claims we would only see about 5:1 dedupe rate using NetBackup, which seems quite a bit lower than what I would expect….and of course they claim they would get about 20:1.  I realize that all data is different, which is why I have hopes that several people will reply with what they are seeing.  Thanks for your time!