[peterfu]

Hi Garteh,
that depends very much of Your network.
If You have a switch or a Router with enough ports, then connect every box (including Your PC) to the switch/router. Use the WAN port of the N5200 and let the IP Adresses be assigned by Your DHCP Server or give every N5200 another IP Adress, which has to be within Your network.
If You don't have the above possibility then You might want to use the build in Switch of the N5200.
Connect one N5200 with the WAN port to Your Router, connect the other N5200 with the WAN port to a LAN port of the first N5200, connect Your PC to a LAN port of the first N5200. Assign manually or use DHCP for the IP adresses.
Copying Data from one to the other will work with every copysoftware which runs on Your PC - however, every file transferred from one N5200 to the other N5200 is first read into Your PC and then written from the PC to the other N5200.
If You have some basic linux knowledge, then a direct transfer is possible - i.e. with the module RSYNC installed on both N5200 You are able to make a direct copy - or You use the build in nsync functionality and then do a manual moving around of the copied files using the linux console (modules SSHD and SYSUSER are needed).
br
Peter