I would think the rsync program (which is what we used to take our data off Sun and Auspex boxen and put it *on* our filer) would be a good choice. We also use it daily to backup local data from our main data servers on to our netapp prior to moving the data to tape. It is a really good tool.

Rsync has options to exclude certain files/dirs which I suspect could easily be used to tell to ignore snapshots (though I would tend towards hiding them as another person suggested).

Rsync can be found at: http://samba.anu.edu.au/rsync/.

Peace, dNb