You can change the properties of the deduplication database (DDB) subclient.
Procedure
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From the CommCell Browser, expand Client Computers > DDB MediaAgent client > File System > defaultBackupSet. 
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Right-click DDBBackup subclient, and click Properties. 
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In the Subclient Properties for DDBBackup dialog box, choose how you want to modify the DDB backup subclient settings: - 
On the General tab, modify general information, such as: - 
Subclient name 
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Drive that hosts the DDB drive snapshot that was created through VSS Copy-on-Write (COW) during DDB backups 
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Number of data readers 
 For more information, see General. 
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On the Storage Device tab, from the Storage Policy list, select a storage policy. 
 
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Click OK.