> Are the changes only to mm?  Or do the client index databases in
> /nsr/res/nsrdb also get altered?
>From 
Technical Guidance for Upgrades to EMC NetWorker 7.4
Service Pack 2
Technical Note
P/N 300-007-011
REV A04
August 1, 2008

"Media database upgrade and client file index conversion
  Upgrading to NetWorker 7.4.x upgrades the media database and
  changes the index directory structure. It is not possible to
"downgrade" a
  NetWorker 7.4.x installation to a version prior to the 7.3.x NetWorker
  release."

Regards,
Cor

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