Yep, it runs on AWS servers due to the fact that the user's device might be destroyed and it has file hosting, automated calls and all that jazz happening which would not be possible if it was stand-alone.

In terms of redundancy and failover, barring a total region blackout on the AWS end, the remote service will continue to function forever due to the way I've set up the infrastructure. If I die then the service will simply be handed over to someone else.