OK,
Just got back. NBU 6.5 looks interesting. ALL disk improvements. In terms of Puredisk, there will be a licensed option for a "Puredisk optimized" Storage unit which can also be replicated to other storage units. Not much detail, but, the way I read it, is you 'could' have a Media server at a remote site with a Puredisk optimized storage unit that replicates with another media server at HQ. This storage unit will be able to be backed up to tape also, not sure if it 'stages' to tape though.... But based on my observations, you could get MOST of your retention on disk with the high level of optimization...