Using FreeRadius as a relay for when external (Cloud) Radius servers go down?

Hi List! I am new to FreeRadius and am wondering: 1) If it is possible to set up FreeRadius as a relay for my external Radius service? 2) Is it possible to use this FreeRadius-server as a fallback when the external service goes down? 3) That would be a good start reading into how to set this up? I have seen "radrelay"[1], but this seems to be old. All help is greatly appreciated, Thanks, KL [1] http://linux.die.net/man/5/radrelay.conf