Changing the number of backup streams when VCT and accelerator are enabled

When you enable both VCT and accelerator in a policy, new tracklogs are created based on the previous tracklogs and VCT data. If you change the number of backup streams in the policy attributes, then in the next backup, the existing tracklogs are discarded. In this case, NetBackup does not use the VCT mechanism for the backup, and performs regular incremental backup. The accelerator optimization is also discarded and all the contents of the volume are backed up.