Applies To: Hitachi NAS (VSP One File), Dell EMC VNX / Celerra/Unity/PowerStore
Use this option to perform a backup from the snapshot created by the file server. This feature is useful to back up a copy of the file system which will not change during the backup.
Notes
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To use this option for Dell EMC VNX / Celerra, the Dell EMC VNX / Celerra SnapSure Snap engine must be enabled on the file system. 
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NetApp file servers do not have this option because they always backup from a snapshot. 
Procedure
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From the CommCell Browser, go to client > NDMP > defaultBackupSet. 
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In the right pane, right-click the subclient, and then click Backup. The Backup Options dialog box appears. 
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On the Backup Options tab, click Advanced. The Advanced Backup Options dialog box appears. 
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On NAS Options tab, select the Back up from Snapshot check box, and then click OK. 
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Select the backup type and schedule. 
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Click OK.