The reason you have a problem here is that you are trying to back everything up using one share (in this case /).
What you need to do is have at least two shares: one for / and one for /media/ncpvolumes/
Then for the / share exclude dev/ proc/ tmp/ mnt/ media/ var/named/chroot/proc var/cache as you have done so in your existing configuration. Make sure media/ is excluded.
Then for the /media/ncpvolumes share do not exclude anything.
That will have the result of backing up everything in /media/ncpvolumes but nothing else in /media.