Best practices: NetBackup duplication
Note the following about NetBackup image duplication:
When duplicating an image, specify a volume pool that is different from the volume pool of the original image. (Use the Setup Duplication Variables dialog of the NetBackup Administration Console.)
If multiple duplication jobs are active simultaneously (such as duplication jobs for Vault), specify a different storage unit or volume pool for each job. Using different destinations may prevent media swapping among the duplication jobs.
NetBackup provides the bpduplicate command to run and script duplication jobs. Veritas, however, recommends using either storage lifecycle policies or the Vault option when you implement duplication as part of a backup strategy.