Running your own branded COPRA Dailies Server is pretty easy: it's basically a file type server handing out clips, with no extensive video-transcoding.
We recommend using either Linux (for example centOS or Ubuntu) or VirtualBox. That way you can run the Server on nearly every modern OS.
Some examples of servers run by our clients:
CPU: 2x 2.2GHz Core i7
CPU: Intel(R) Xeon(R) CPU E5-2676 v3 @ 2.40GHz
CPU: Intel(R) Xeon(R) CPU E5-2643 v4 @ 3.40GHz