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> I think the main risk of the HN architecture is that (I believe) it's a single datacentre in a single location.

Exactly, Amazon US EAST makes the same point several times a year! :)

We should ask this question to ourselves: As a user, if I have to manage the risk of US-East-1 going down, may be we should question this entire Cloud thing. It was marketed as "100% bulletproof" in 2005 when we discarded on-prem.

To be fair to amazon I don't think they've had an outage that affected different data centres at the same time, but yes I would far rather have my main and backup on two providers in two appropriately diverse locations.

but never forget that AWS uses us-east-1 to host core services that, when they go down, they take almost the whole thing down, no matter which region.

Which specific services?

I only use VMs and route53, and form what I've seen when us-east-1 is down I can still resolve my domains

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