I think people over think how hard this actually is. Data replication isn't a new concept. You can use RAID with a NAS or setup async replication with operators

I think people over think how hard this actually is. Data replication isn't a new concept. You can use RAID with a NAS or setup async replication with operators for things like Postgres/SQL. Obviously it's worth doing simulated disaster recovery to ensure you would recover if there is hardware failure. The larger the scale and throughput with parallel writes against the same keys, etc then the more complicated the setup will be. I hope to write more on this topic, but setting up a persistent volume with a NAS is a great way to ensure high durability.