You can retain additional versions of your file, including the latest version, when you perform a synthetic full backup.
By default, the latest version of files are included in the synthetic full backup. You can also choose to keep the older version of the files for a specific number of days.
Procedure
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From the CommCell Browser, expand Client Computers > client > agent > backup_set. 
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Right-click the subclient, and then click Properties. The Subclient Properties dialog box appears. 
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Click Advanced. 
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The Advanced Subclient Properties dialog box appears. 
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On the Retention tab, Older file versions area, select one of the following options: - 
Keep older versions for n years n months, and n days Type a value for the time period for which you want to retain the older versions of the file. All data-stub pairs and specified versions of the data are retained for the specified time period. 
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Keep n versions Type a value for the number of versions you want to retain, starting from the latest back up. If you clear the Keep n versions check box, all data-stub pairs and the latest version of the data is backed up. 
 
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Click OK.