HA and Disaster Recovery has transitioned from a cost per GB discussion on media to a pure recovery metric. The key to a recovery metric is the recreation of the server, storage, networking, applications, and how those components were previously integrated. The challenge is that the data might be preserved but the recovery might be compromised by dozens of patches of the operating system; dozens of patches to the application; the reconstruction and interaction of all the components. Protecting data is paramount to recover but exactly replicating a server or servers is the key to fast and accurate recovery.
Recovery Point & Recovery Time