Advice on making our AMS Service more reliable

Hello,

I need some advice on how to make our Service more reliable against crashes.

We currently use one Server with the AMS Software on it. Now we consider making some sort of failsafe. So if that Server is unavaiable another can take the job.

Do we need a second license if we want to have another AMS Server which is idle until it really is needed? I mean it would then only be in use if the main server crashes.

What are our options?

Als we consider making it more scalable so as to user more than one machine or a scalable virtual machine.

We use the AMS for a webcam application where people can chat via cam to each other over RTMP.

Any piece of advice would be great!