Anyone know of a good system to archive files on a nw6sp4 server?

I have users that don't ever want to delete anything, and I'd like to
move these files that have not been accessed or modified in the last
year or more to a different volume.

I'd still like these archived files to show up as in the 'live' folder
(even tho they're not), so the user could still access them if for some
reason they're needed down the road sometime.

Any suggestions?