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Yet another reason I swear by Heroku - you can rollback to the actual prior release, not rollback the code and try to rebuild.

Doesn't AWS do this too?

Depends on which of their 150 services you're talking about. You can't do it on CodeDeploy.

Which service? EC2 doesn't - at least not inherently, there might be a way to snapshot the machine's state; I'm not sure.