Machines fail, systems fail, power fails, software/hardware fail and also the usual suspect - Human error. ( under the guise " software upgrade " )
There is no fool proof way to ensure nothing will ever fail no matter how much redundancy you have in place. Failure is not an option, its a reality.
How you brace against this failure and move to restore is the key. Just like insurance on your home or car ( or whatever else ) its only utterly important when you need it.
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