Cyber war and cyber terrorism is real and is being waged. Cyber terrorists and cyber warriors are attacking systems and succeeding in their attacks. This requires management to prepare for the worst case, the loss and destruction of critical data and systems. This chapter helps management prepare for this worst case by discussing how to design and build emergency response systems. These systems are used to respond to worst case attacks. Additionally, these systems are useful for responding to other disasters that can cause the loss of systems and data. This chapter presents research into emergency response systems and concludes with a model of what an emergency response system should consist of.