Hello,
In order to backup a NAS server, you can create user defined selections. It is also recommended to create a separate job for backing up NAS.
Check its compatibitlity first as per the link below:
http://support.veritas.com/docs/237737
Also refer to the following link:
During the backup of some Network Attached Storage (NAS) devices, the message "Remote Agent is not present" appears in the Activity Monitor.
http://support.veritas.com/docs/242619
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Regards.