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Testing disaster recovery plan

Once the Disaster Recovery Plan document is created, the knowledge it contains must be tested periodically. Testing a disaster recovery plan means going through the actual steps of the plan, e.g. going to the backup site and setting up the backup site in operation, and resuming normal operations after the "disaster" is over. Most of the tests do not attempt to perform 100% of the tasks in the plan; instead a selected number of operations are relocated to the backup site, and are returned to normal operation at the end of the test.
Changes in an organisation will have direct impact on the Disaster Recovery Plan. The Disaster Recovery Plan created today may not remain valid after 2-3 years. So, periodical maintenance of the Disaster Recovery Plan is essential to reflect the changes taking place.