When you perform a block-level full instance backup, the entire volume where the PostgreSQL data directory is mounted is backed up, irrespective of the files available on the volume.
For subclients with block-level backups enabled, you can switch to traditional backups if your requirements change, but the next backup after the switch is always a full backup.
Procedure
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From the CommCell Browser, expand Client Computers > Client > PostgreSQL > Instance > FSBasedBackupSet. 
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Right-click the subclient that you have configured for performing a block-level backup, and click Backup. 
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In the Backup Options dialog box, select Full as the backup type. 
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In the Job Initiation section, choose whether to run the backup job immediately or schedule it. 
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Click OK. 
Result
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The Job Controller displays the full backup job as Snap Backup. After the full backup job is complete, log backup job starts automatically. You can view detailed information about a backup job, such as the objects that were backed up or the backup option used. For more information, see View Details of a Block-Level Backup Job. 
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To move snap to media, perform a backup copy operation. For more information, see Backup Copy for IntelliSnap Backup.