If you want to perform block-level backup operations on a SQL database, then you must select the Optimize for table level restore check box at the subclient level.
Procedure
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From the CommCell Console, click Client Computers > client > SQL Server > instance. 
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Right-click a subclient for which you want to enable block-level backup operations, and then click Properties. The Subclient Properties dialog box appears. 
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On the Advanced Options tab, select the Optimize for table level restore check box. A message appears that tells you that the next backup will be converted to a full backup. 
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Click OK to close the message. 
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Click OK.