You can use Network Data Management Protocol (NDMP) or the Data ONTAP dump command to archive each of the LUNs that contain data for the backup set that you want to archive directly from the storage system to the archive medium, without involving Exchange or the Exchange server at all.
NDMP and dump command are the most efficient methods for creating archives of the LUN drive files. LUN Snapshot copies are made, copied to the archive medium, and deleted as shown in the following diagram.
For more information about backing up storage system data to tape, see the Data ONTAP System Administration Guide for your version of Data ONTAP.
/vol/ExchVol/.snapshot/exchsnap__SRVR3_01-20- 2006_12.05.58__Daily/exch1db.lun