Mark, I really didn't want to hear that! We're planning a 2012 migration for this year, the main reason being the dedup feature to help us out with our ever growing file servers.
I really can't afford to save space on the SAN, but end up with bigger backups!
Can you tell me if the 2TB of data is deduped more than 50%? ie. if you had no OS dedup, would the backup of been 4TB anyway? Or are the backups bigger than they would of been on a 2008 server say?
What about incrementals, are they suffering the same jump in size of 50%?
There's always something to spoil the party
So... our incremental backups are using between 20-40 Gigs each and we are doing a backup daily. Not too bad considering how large the drives are.
As for our deduplication rate on the File server, we have multiple drives and here are the rates,
26% - Small file share
48% - Main Office share of documents
27% - Images and backups
29% - Home directories
41% - Software
30% - Production file share
Also we are a heavy pdf shop so that probably brings our office and production share rates down a bit as pdf's do not dedupe very well.
As for the size if we had not deduped, well I don't know that one as we have never backed it up with Veeam prior to the deduplication. We were using SAN snapshot and replication.