Configure a snapshot backup for NAS device

Hi

I am trying to to create a snapshot for a NAS device. Today I am running NDMP backup on CIFS server ( VNX5800) works fine but takes a lot of time.

I am running the wizzard and when I come to "Type a list of valid save sets to be backed up for this NAS device" i get confused !

Whats is the correct syntax here ?

If I use the same as in NDMP , it will fail

Error in NW : ( see pic )

Guess I am doing something wrong, but what ?