Im currently starting a new project just a little one on the side. Basically we have a NAS 200gb for all the departments to put there work on. We want to auto move unused files

basically

Server1 - NAS
Server2 - Old server bunch of drives
Server3 - same config as server2
TapeDrive - Does our backups

Basically we want to move files not used in the last 6months to either server1 or 2 and add a shortcut, we want to use them as archives (because we are governemt somethings need to be kept several years)

We will back these servers up everytime stuff is added maybe a scan is ran every 2 or 3 months. Any ideas guys would like to keep the cost to nothing if possible

*sort of the same thing symantec enterprise vault does*