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I don't think I've worked anywhere where there was a simple way to switch cloud providers with the push of a button. Even migrating to different locations within a cloud provider isn't trivial. You'd have to invest a lot of engineering time from the beginning to get this kind of capability, and you may never realize any value for all the pain.

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Yep; not easy at all ... if it were easy everyone would do it :) I think with tools like puppet and orchestration tools like heat, etc it is getting closer to being easier.

I did got to a Netflix talk once where they said that while moving from AWS would huge, they had a plan and I think from memory they said it would take about a week.

in my team we had the scripts ready for a second provider (but not the hot backups, I couldn't get that far).

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