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Build redundancy and safe failure into critical systems.

All ‘core’ systems (i.e., food, water, shelter, power, communications, transportation) need to have built-in redundancy so that they can continue to work during and after extreme events. For example, key communication nodes should have reliable backup power systems. But all systems will eventually fail. Core systems need to be built so that when system components fail, they fail in safe, predictable ways, preserving as much functionality as possible.

PERC Reports