About concurrent copies
You can create up to four copies of the same backup image concurrently. Those copies are created concurrently by the Inline Tape Copy feature. If the images are created during a NetBackup policy job, all are considered original images.
You must configure NetBackup to allow a sufficient number of copies in the field for the NetBackup primary server. (Configured in for the primary server.) By default, the value is two.
All storage units must be connected to the same media server. Also, you must configure the storage unit to allow a sufficient number of concurrent jobs to support the concurrent copies ( or setting).
You can write images concurrently to the following storage units:
Media Manager storage units. If the Media Manager storage unit has more than one drive, the source storage unit and destination storage unit can be the same.
Disk storage units.
Disk staging storage units.
If you create multiple original images concurrently during a NetBackup policy job, the backup time that is required may be longer than for one copy. Also, if you specify both Media Manager and disk storage units, the duration of disk write operations match that of slower removable media write operations.
You cannot create images concurrently using the following:
Storage unit groups
Quarter-inch cartridge (QIC) devices
Third-party copies