I'm trying to think of the economic way to run a robust small scale service. I think you need a way to rapidly spin up a replica service on an entirely differen

I'm trying to think of the economic way to run a robust small scale service. I think you need a way to rapidly spin up a replica service on an entirely different provider. I'm picturing a setup where you run on a cheap Hetzner host or similar with the DB synced to a slave replica on EC2 or other cloud provider and a build system so that you can spin up a whole replacement infrastructure on EC2 if there is a severe outage or failure in commercial relationship and switchover by changing the DNS settings.