If a San Lun typically a host agent to get file level. For NAS either ndmp software or from the client over Nfs or cifs. Ndmp for most data sets but it is at the volume not namespace and requires ndmp run on the node that owns the volume. Node affinity. A vol move to another nodes requires a config change to the new node for ndmp. A host backup may be slower but is from the namespace and doesn't need node affinity. But may be slower. The backup matrix shows supported backup/ndmp vendors..
If you keep enough snaps and remote snapmirror that may do too. No snapvault yet in cluster mode.
