> but two servers rooms in different locations, with resilient power and network is a bit too much effort IMHO

I worked in a company with two server farms (a main and a a backup one essentially) in Italy located in two different regions and we had a total of 5 employees taking care of them.

We didn't hear about them, we didn't know their names, but we had almost 100% uptime and terrific performance.

There was one single person out of 40 developers who's main responsibility were deploys, and that's it.

It costed my company 800k euros per year to run both the server farms (hardware, salaries, energy), and it spared the company around 7-8M in cloud costs.

Now I work for clients that spend multiple millions in cloud for a fraction of the output and traffic, and I think employ around 15+ dev ops engineers.