Restoring Data from a Specific Copy
If you specify a copy precedence number for a restore, the software searches only the storage policy copy with that precedence number in each of the storage policies through which the data was secured. If data does not exist in the specified copy, the data recovery operation fails even if the data exists in another copy of the same storage policy. Therefore, it is recommended to specify the copy precedence for a restore operation in the following scenarios:
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The primary copy is no longer available for a restore operation due to a hardware failure.
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You know that the media containing the data for a particular copy have been removed from the storage library. In this case, you can choose to restore from a copy whose media are inside the library.
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You want to restore from a selective copy.
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You want to restore from a copy that accesses faster disk media rather than slower tape media.
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You know that the media drives used by a particular copy are busy with another operation and want to restore from a different copy to avoid resource conflicts.
Exporting Media Before Deleting a Disaster Recovery Storage Policy
It is recommended that you do not delete a Disaster Recovery Backup storage policy before exporting the media containing your Disaster Recovery Backups. If you delete a Disaster Recovery Backup storage policy before exporting this media, the media may be used by another data protection operation and it can be overwritten. Once the media is exported, you can use Media Explorer to restore the metadata from this media.
Using Media Optimally with a Global Secondary Copy Policy
You can use a global secondary copy policy to optimally use the tape media. For auxiliary copy operations, the storage policy copies use unique media. When a tape media is assigned to a storage policy copy, no other storage policy copy can run an auxiliary copy operation on this tape media, even if the media has available storage space. You can run an auxiliary copy operation only after all the backups on the media are aged off. However, if you assign multiple storage policy copies to a global secondary copy, you can run multiple auxiliary copy operations on the same tape media.
For more information, see Share Tape Among Backup Copies.