No matter what, you are backing up a snapshot. NDMP uses the native netapp dump utility. If you dump the live filesystem, netapp dump creates a snapshot and dumps that. If you want to avoid this ad hoc snapshot, then just back up a snapshot such as /vol/vol0/.snapshot/nightly.0
If you are backing up over NFS or CIFS, then you can back up the live filesystem. But dumping a snapshot is much better because it doesn't change during the dump.
Steve Losen scl@virginia.edu phone: 804-924-0640
University of Virginia ITC Unix Support