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Going to upgrade from 10d - Should I go 11d or 12?

Created: 08 May 2008 • Updated: 02 Mar 2009
Hi there
We're looking to upgrade out current BackupEXEC 10d environment to either 11d or 12.  Just wondering if anyone can point me in the direction so I can compare what each version would give me....
Any help appreciated.
Ronnie Walker