I'm probably going to get a lot of flak here, but if the damages are that all emails have to wait for a day twice in a year, then that's quite a good product.

While we can engineer a system with better availability, seems the market is quite ok with one or two nines for this.

So the trick would be not to make anything truly critical depend on such a service. And no, payroll is not enough, I'm talking OT.