Disaster Recovery

Disaster recovery is your plan for when things go truly wrong, such as if a whole data center fails (rather than a single server). The idea is to keep a replicated copy of your site in a separate standby environment so you can fail over to it and get back online instead of starting from scratch.

Disaster recovery goes a step beyond a backup: a backup is the saved files, while disaster recovery is the whole plan for getting running again, and how fast. How much you invest depends on how long your organization could survive being completely dark.