You can configure the CommCell Console to perform a transaction log backup, without first running a full backup.
Procedure
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From the CommCell Browser, click Client Computers > client > SQL Server > instance. 
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Right-click a subclient, and then click Properties. The Subclient Properties dialog box is displayed. 
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On the SQL Settings tab, select the Disable Log Consistency Check check box, and click OK. 
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To disable the backup rules, click the Backup Rules tab, and then clear the Convert check box. 
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Click OK.