Fun story: I once heard of a startup that was keeping all their data on ephemeral local storage, mirroring it between instances across AZs for "high availabilit

Fun story: I once heard of a startup that was keeping all their data on ephemeral local storage, mirroring it between instances across AZs for "high availability", and then, er, using spot pricing for all instances to save money. One day the spot price skyrocketed and all their databases got shot down. And that, I presume, was the end of the company.