I'm 99% sure I'm reading something wrong, as that's incredible expensive unless this is hosting LLM models or something similar, but it seems like it's a website for sharing expenses?
A more charitable reading is that they pick the technologies that the jobs they want are hiring for, even if they don’t make sense for this simple application.
It's certainly possible to spin up your own db backup scripts, monitor that, make sure it gets offsite to an s3 bucket or something, set yourself a calendar reminder to test that all once a month, etc... but if I had to write out a list of things that I enjoy doing and a list of things that I don't, that work would feature heavily on the "yeah, but no" list.
DHH (Rails founder) thinks you should dare to connect a server to the internet: https://world.hey.com/dhh/dare-to-connect-a-server-to-the-in...
(I already submitted this once, but given the discussion here, I think it's worth posting again, if my rate limit allows it)
That can backfire and give an employer the idea you want to do that work though. I not only hate it, but nobody gives a damn until stuff breaks and then everyone is mad. You rarely get rewarded for stuff silently sitting there and working.
edit: to be clear, I think doing it yourself once is great experience. And I've run small web apps on a single server, all the way from supervisord -> nginx -> passenger -> rails with pg and redis. I'd rather build features or work on marketing.