I once took down a stock ordering service of the company I was working for at the time, and couldn't roll back the changes because backups were manual and I'd taken an old copy from the wrong server. Took half a day for me and 2 other developers to figure out what had gone wrong and how to fix it. It didn't help we were required to do them at 3 am.
Needless to say, I've learned to triple check the deployment plans before I'm sleep deprived.
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