Or you just use something like CockroachDB, YugabyteDB etc that auto replicate, auto rebalance if a node goes down, and have build in support for backups to and from S3...

Or if your a bit more hands on, multigress seems to be closing to completion ( https://github.com/multigres/multigres ) from the guy that make Vitess for Mysql.

The idea that managing hardware and software is hard, is silly yet, people (mostly managers it seems ) think its the best solution.