Talking about computers and software, having redundant "chains" aren't uncommon. That's one of the fascinating things about software, we still have no reason t

Talking about computers and software, having redundant "chains" aren't uncommon. That's one of the fascinating things about software, we still have no reason to trust it to the degree that engineers who build bridges trust their work. There are almost never a backup bridge, and we quickly dismantle ferry routes as bridges are erected. As developers and systems administrators we expect things to fail, if we're any good at our jobs, and implement redundancy, write restore procedures and in some cases create manual backup processes. Yet it's not uncommon to have multiple links fail and still bring down our towers of complexity and instability.