You can define retention rules for WORM enabled disk storage pools.
Procedure
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From the navigation pane, go to Storage > Disk.
The Disk page appears.
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Click the disk storage for which you want to define the retention period.
The disk storage page appears.
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On the Configuration tab, in the Retention rules section, click the Edit icon.
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Enter the amount of time to retain the backups, and then click Submit.