I have this job on my BE 3600 Appliance and when I ran it to my NAS it took it 10 hours to run i think something is wrong. I looked at the log and it has all kinds of volume shadow copys on it 450 gigs worth which what took the amount of time to copy. I can't find a way to reduce this number so my job will run quickly.
Split off into a new discussion...
So you're backing up your data to the BE 3600 appliance, and then streaming off to a NAS and getting poor performance? That's because the data that gets backed up to the BE 3600 appliance is deduplicated...streaming off to anything else will rehydrate the data to the original size, and this is most likely what is happening in your case.