(2014-12-12)
Problem
I have two (or more) NPS (Network Policy Server) servers and I want them to have the same client and policy set.
Solution
Make all your changes on one server.
Then export that configuration:
> netsh nps export filename = "config.xml" exportPSK = YES
Copy the file to the other NPS server(s), and on each import that configuration:
> netsh nps import filename = "config.xml"
These commands do not require powershell.
Beware that doing an export like this exports shared radius secrets and should be protected appropriately.