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The Duplicate Backup Set template enables you to use a multi-stage backup strategy for backing up data to disk and then copying it to tape. The duplicate backup template does not replace the existing Duplicate Backup Sets option. Instead, it provides an automated, alternate method of duplicating backup sets. It allows for multiple levels of data duplication either within the backup window or outside of the backup window.
Duplicate backups are useful in the following situations:
You want to stage your data. For example, you may want to back up data to disk with a 28 day retention (stage 1), then copy the data to another disk for three months for longer term storage (stage 2), and then move the data to tape for offsite storage (stage 3). A policy for this example staging would include a backup template to back up the data to disk for the 28 days, a duplicate backup set template to copy the data from the original disk to the second disk, and another duplicate backup set template to copy the data from the second disk to the tape. Each of these stages may have a different media set to define the data retention period differently for each stage.
You want to reduce your backup window. For example, create a policy that contains a backup job template that uses the Backup-to-Disk option to back up data to disk during the backup window. Then create a duplicate template to copy the backed up data from disk to tape and schedule the duplication job to occur outside the backup window.
You want to create a duplicate set of backup tapes to store offsite. For example, create a backup template to back up data to either disk or tape. Then create a duplicate template and either set the duplication job to run immediately after the first backup job completes or schedule it to run at a specific time.
If you need to restore data from duplicate backups, you can restore from the source backup or from any of the duplicate backups.
You can use the following methods to configure duplicate backups:
The direct link method. This method requires a policy with one backup template and one duplicate backup template. The direct link is established by the After <Template A> completes, start <Template B> to duplicate the backup set template rule, where <Template A> is the backup template and <Template B> is the duplicate template. The template rule provides a direct link between the backup job and the duplication job.
The incremental duplication method. This method requires at least one backup template and at least one duplicate template. If a policy contains several templates, you can use this method to associate one duplicate backup template to several backup and/or duplicate backup templates. With this method, use the Duplicate all backup sets that were created by <Template A> using <Template B> as scheduled template rule.