Some important to-do's must take place after setting up the network policy server.
While setup is very straight-forward, the overall maintenance and health is not.
For some reason, Accounting only rotates NPS logs after the disk is full. Which should be never..
Open partition manager:
Shrink the disk NPS lives on
Open NPS > Accounting
Change the logging destination from C:\Windows\System32\Logfiles
to the parition created in step 1
If you let the defaults grow for too long, those log files become obnoxiously huge.
While they can be deleted without restarting anything (Event Viewer does not need to be restarted), it's probably best to not delete the latest one, until the date has aged and logs started storing to the new partition.
IN2202.log
type-named log (INYYMM.log) and earlier - compare timestamps and leave the current one until you're certain it's no longer being written to