I am currently migrating my Windows backup environment from CA ArcServe to NetBackup. So far my experience has been great. My only issue has been with the poor management of the ArcServe environment. To get around ArcServe client licensing, many (over 100) clients have been backed up over the network using Windows administrative shares (i.e. - \\hostname\e$\backup\path\). While the SysAdmin team understands the need for the client install, the Application Teams have been hesitant to have a "new" and "unproven" application installed on their servers. We are overcoming this obstacle and are successfully moving forward.
We stood up the initial environment (one master server and two media servers attached to an EMC VTL which is hosting a NBU media server for output to a Quantum Scalar i500 for physical tape vaulting) in about a week. Around 75% of our backups were migrated over to the NBU environment after initial testing was completed. The remaining jobs will be moving over after we complete head to head testing for MSSQL database backups (NBU Client vs. LightSpeed).
NBU operates a lot better than our old ArcServe environment. A portion of that has to do with a better architecture (higher tape density, backup to disk vs backup to tape), but it feels a lot faster and more efficient than the old environment.
The best thing about NetBackup is restores, in the old ArcServe environment we could never get the restore by tree function to work and were forced to use restore by job. Restoring with NBU is much easier.
Hope this helps.
Cheers,
Josh