Point in time restore of RDS databases is based on the Commvault orchestration of RDS automated backups. For more information about RDS automated backups, go to the AWS documentation.
Procedure
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From the navigation pane, go to Protect > Databases.
The Overview page appears.
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On the Instances tab, click the AWS RDS instance.
The instance overview page appears.
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On the Configuration tab, in the Point in time restore settings tile, do the following:
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Move the Enable point in time restore toggle key to the right.
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In the Retention period area, click Edit
 and then update the number of days. - 
Click SUBMIT
 
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Note
When you back up the point in time restore enabled instance, the retention period will be updated in the AWS console.