Spool copy can be enabled on a copy.
Applies To
Synchronous Copy, Inline Copy, Parallel Copy, Snapshot Copy and WORM Copy.
Before You Begin
Consider the following before enabling a spool copy:
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A primary copy or secondary copy can be defined as a spool copy only when there is an active synchronous copy for the storage policy. 
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Spool Copy feature is not supported on storage policy copies enabled with Deduplication or Silo Storage. 
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The DDB backup jobs ignore the spool copy retention rules, and follows the DDB backup pruning. See DDB Backup Pruning Process for more information. 
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For NAS data backed up using IntelliSnap backup: - 
One snapshot is retained when the primary snap copy is configured with spool retention. - 
For NetApp and Isilon NDMP agents. 
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For NetApp, Isilon and Huawei FS under NAS agents. 
 
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Other agents have the retention rule set to 0 days and 0 cycles. 
 
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Note
Deduplication enabled storage policy copies cannot be configured as spool copies.
Procedure
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Before enabling spool copy option on a storage policy copy, ensure that the storage policy copy is assigned as a source to another active synchronous copy. See Specify the Source for the Copy for instructions. 
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From the CommCell Browser, go to Policies > Storage Policies ><Storage Policy>. 
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Right-click the storage policy copy that was assigned as a source, and click Properties. 
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In the Copy Properties dialog box, click the Retention tab, click Spool Copy (No Retention), and then click OK. A message appears that tells you that enabling spool copy will age data as soon as the Auxiliary Copy job is run. 
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Click Yes to continue.