When thinking of a disastrous event, we usually think of an earthquake, flood, hurricane, war, or act of terrorism. Statistically, though, most DR situations are caused by mundane events. Up to 43% are caused by power failure and up to 13% are caused by a human error.
Studies also show that even though DR may be expensive, every $1 spent on business continuity measures saves around $4 in recovery costs.
While High Availability aims at continuous operation in case of minor incidents, such as a single server malfunction or a storage rack failure, Disaster Recovery involves protection against major events. Hence, while High Availability is typically achieved by synchronous replication and component redundancy, Disaster Recovery ...
