If you have set up a global deduplication policy for your environment, you can change the global deduplication property values for the storage policy copy.
Procedure
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From the CommCell Browser, expand Policies > Storage Policy > storage_policy. 
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Right-click the appropriate storage policy copy associated with the global deduplication policy and then click Properties. 
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In the Copy Properties dialog box, click the Deduplication tab to modify the advanced deduplication options, such as: - 
Temporarily disabling deduplication for diagnostics and maintenance purposes 
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Sending only unique data to the destination copy by using Deduplication Accelerate Streaming Hash (DASH) Copy 
 For more details on the advanced options, see Advanced. 
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Click OK.