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What happens when the backup breaks?

At a certain point earth is a single point of failure.

You have a back up for the back up backup.

Turtles all the way down.

At AWS scale even unlikely hardware events become more common I guess.

Each turtle gives them another 9. How many 9s are they down due to incidents over the past year?

They're definitely more than half a day now, which is only two and a half nines.