Commvault does provide for dumping to native BKP files its an option on the setup of your backup I believe. I don't think many people use the tool because it is very expensive when you figure in the cost of their infrastructure behind the scenes and if you aren't using a SAN such as EMC or Netapp and fiber channel for your backend you are not going to see the full benefit of the tool. We were told it is as fast as your slowest piece of hardware in the chain. So that could be disk, network Etc, Etc.