Applies to: Exchange 2007 or later, and IntelliSnap
By default, the preselected backup type is incremental. However, you can change the preselected backup type.
After you change the preselected backup type, a full backup runs automatically before the new preselected backup type runs.
Note
If a preselected job fails or is killed during the Archive Index phase, the next job will convert to a full backup.
Procedure
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From the CommCell Browser, expand Client Computers > client. 
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Right-click Exchange Database, and then click Properties. The Exchange Database Properties dialog box appears. 
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In the Backup Type area, select the appropriate backup type. - 
Incremental: Transaction logs are truncated by the Exchange server. 
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Differential: Transaction logs are not truncated. 
 
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Click OK. The next backup that runs will be a full backup.