You can remove a filter by deleting it from the exclusion list. After a filter is removed, data is not backed up during a differential backup operation of a subclient.
You should manually delete any exception entries of the deleted filter. Else, they will automatically get deleted, unless you have used wildcard expressions in the exclusion path.
Procedure
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From the CommCell Browser, expand expand Client Computers > client > SharePoint Server > Documents.
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Right-click the subclient, and then click Properties.
The Subclient Properties dialog box appears.
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On the Filters tab, in the Exclude these folders box, select the folder that you want to delete.
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Click Delete.
The filter is removed from the list.
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Click OK.