Hello,
Don't know the answer to that, however, you can direct  NDMP backups to 
non NDMP devices over the network, or else you would need to be licensed 
for NDMP Tape server and this solution should require locally attached 
NDMP devices.
Thanks

To sign off this list, send email to listserv AT listserv.temple DOT edu and 
type "signoff networker" in the body of the email. Please write to 
networker-request AT listserv.temple DOT edu if you have any problems with this 
list. You can access the archives at 
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER