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Or just 1 or 2 physical machines?

Well we still need to handle AWS losing a region and hardware replacement. Does happen quite regularly.

But do you?

Do you really need those 5 nines?

If my bank can go down every week for patching, you probably can too.

Our customers can't operate at all if our systems are down, so yes we do.

I’m sure your customers can go down for a minute every other week.

It doesn't matter if they can or cannot. This is what happens when you think like an engineer and not like a salesperson.

What matters if they will pay someone else for that reliability they don't need.