About creating duplicate images concurrently

You can create multiple duplicate backup images concurrently either by using the NetBackup Catalog node or by configuring the Duplication tab of a Vault profile. Duplication is not always possible, so you must understand when you can use duplication in NetBackup.

See Creating concurrent copies through the catalog node.

See Creating concurrent copies using the basic duplication tab.

See Creating concurrent multiple copies using the advanced duplication options.

Table: Possible circumstances for duplicating a Vault profile describes when duplication is and is not possible in NetBackup.

Table: Possible circumstances for duplicating a Vault profile

Possible to duplicate backups	Not possible to duplicate backups
From one storage unit to another. From one media density to another. From one server to another. From multiplex to nonmultiplex format. From multiplex format and retain the multiplex format on the duplicate. The duplicate can contain all or any subset of the backups that were included in the original multiplexed group. This process is done with a single pass of the tape. (A multiplexed group is a set of backups that were multiplexed together during a single session.)	While the backup is being created (unless you create multiple backup images concurrently during the backup job). While any other backup image is being written to a tape that contains the source primary backup. When the primary backup image is not available. By using the NetBackup scheduler to schedule duplications automatically (unless you use a Vault policy to schedule duplication) of the NetBackup catalogs. When it is a multiplexed image of the following: Auspex FastBackup NDMP backup Backups to or from disk type storage units Nonmultiplexed backups

Possible to duplicate backups

Not possible to duplicate backups

From one storage unit to another.
From one media density to another.
From one server to another.
From multiplex to nonmultiplex format.
From multiplex format and retain the multiplex format on the duplicate. The duplicate can contain all or any subset of the backups that were included in the original multiplexed group. This process is done with a single pass of the tape. (A multiplexed group is a set of backups that were multiplexed together during a single session.)

While the backup is being created (unless you create multiple backup images concurrently during the backup job).
While any other backup image is being written to a tape that contains the source primary backup.
When the primary backup image is not available.
By using the NetBackup scheduler to schedule duplications automatically (unless you use a Vault policy to schedule duplication) of the NetBackup catalogs.
When it is a multiplexed image of the following:
- Auspex FastBackup
- NDMP backup
- Backups to or from disk type storage units
- Nonmultiplexed backups

If you do multiplexed duplication, be aware of the following:

When you duplicate multiplexed SQL-BackTrack backups with multiplex mode enabled, it is necessary to duplicate all of the backups in the multiplexed group. This ensures that the fragment order and size are maintained in the duplicate. Otherwise, it is possible that restores from the duplicated backups will not work. A multiplexed group is a set of backups that were multiplexed together during a single multiplexing session.
When you duplicate multiplexed backups, the multiplex settings of the destination storage unit and the original schedule are ignored. However, if multiple multiplexed groups are duplicated, the grouping within each multiplexed group is maintained. This means that the duplicated groups have a multiplexing factor that is no greater than that used during the original backup.
If all backups in a multiplexed group are duplicated to a storage unit that has the same characteristics as the one where the original backup was created, the duplicated group is identical, with the following exceptions:
- If end of media (EOM) is encountered on either the source media or destination media.
- If any of the fragments in the source backups are zero length (which can occur if many multiplexed backups start at the same time), during duplication these zero-length fragments are removed.

About creating duplicate images concurrently

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