If the media for the copy with the lowest precedence is offsite, damaged, or if hardware resources are unavailable, then you can change the copy precedence of a copy.
Procedure
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From the CommCell Browser, go to Policies > Storage Policies. 
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Right-click the appropriate storage policy, and then click Properties. 
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On the Copy Precedence tab, select the copy. 
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Move the copy to the position for the precedence that you want the copy to have. 
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Click OK. 
Related Topics
Changing the Copy Precedence of a Storage Policy Copy Using XML File