For the Media Server Deduplication pool option (MSDP or a.k.a. MSDO), front end licenses is required for the amount of data a customer wants to store.
However, there are no messages, meters or warnings with regard to the current status of the amount ...
Via Storage Lifecycle Policies (SLP) in NetBackup, you can currently perform optimized duplication (OpDupe) from the Media Server Deduplication Option (MSDO or a.k.a. MSDP) to PureDisk, and MSDP to MSDP.
MSDP -> PureDisk
MSDP -> MSDP
...
NetBackup 7.0.1 brought with it the NDMP Deduplication Stream Handler.
http://www.symantec.com/docs/TECH135812
However, this is for NetApp filers only. There also needs to be a deduplication stream handler for EMC Celerra filers.
...
Add NetBackup 7 client-side deduplication support for 64-bit Intel versions of Mac OS X 10.6 and 10.7.
10.5 is also a 64 bit OS so 10.5 is also a 64 bit OS so going back to 10.5 might not be much more work. However 10.6/7 would be a help for ...