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Do you have any actual sources of their average instance uptime over the year?

I see an SLA of 99.95%(~4hrs/year) on the site but cloudharmony.com/status has AWS at the top. Googling average ec2 uptime has people posting instances running for years with nothing.

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I don't doubt that ec2 instances probably have good uptime on average. But instances can mysteriously disappear, that is a fact, and if you are on AWS you should plan for it. They give you all the tools you need for such planning.

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