You can create a subclient to use for performing backup operations.
Procedure
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From the CommCell Browser, right-click the DumpBasedBackupSet and then click All Tasks | New Subclient. 
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On the General tab, in the Subclient box, type a unique name for the subclient. 
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On the Content tab, specify the data to include in the backup: - 
Click Configure. The PostgreSQL Database Configuration dialog box appears. 
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Click Discover. 
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In the Database Name column, select the databases to include in the backup. 
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In the Subclient Name column, select the subclient to associate with the database. 
 
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Click OK. 