This document discusses how cloud computing provides benefits for disaster recovery of securities exchanges. It notes that regulated exchanges must have a disaster recovery site and plan to restore trading if their primary market becomes unavailable due to natural disasters or other events. The International Securities Exchange (ISE) developed a cloud-based disaster recovery solution using Amazon Web Services that provides availability, operability, efficiency, security, velocity, elasticity and agility. This solution allows ISE to automatically "light up" a disaster recovery environment in the cloud as needed, reducing costs compared to traditional on-premise infrastructure. The cloud-based approach provides security, scalability, automation, and is cloud agnostic.