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Demultiplexing speeds up future restores and is useful for creating a copy for off-site storage. Use the duplication process in the Catalog utility to demultiplex a backup.
Duplication allows one multiplexed backup at one time to be copied from the source media to the target media. When duplication is complete, the target contains a single demultiplexed copy of each duplicated backup. (The target can also contain other backups.) The duplicate copy can be made into the primary copy. Do not select Preserve Multiplexing in the Setup Duplication Variables dialog box when backups are duplicated.