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Redundancy provides availability more than reliability.

The odds of GitHub going down and your local copy/instance simultaneously is very low so availability is high.

Reliability is how often GitHub or your local instance goes down.

Your local instance of github and github.com are not redundant / interchangeable. If either of those goes down and you rely on it, the other one is not gonna help you much, so availability is not improved by using a local instance.

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