About this interactive
Sometimes an incident response plan is not enough and a disaster recovery plan has to take over.
An incident response plan is for responding to an incident: someone reports a service down or something strange on the network, and the team works out what is going on and fixes it.
Disaster recovery (DR) is recovering from something catastrophic: a total system meltdown where servers must be replaced, corrupt or missing data that needs a full restore, or a whole data center offline, so the business fails over to a hot, warm or cold site. Disaster recovery usually starts as incident response: the team troubleshoots, realizes it is a total meltdown, and pulls out the DR plan. What matters is less the cause (fire, earthquake, cyber crime, a utility disruption) than the effect on the systems.
These two are about IT systems. A contingency plan and a business continuity plan are bigger in scope: they cover business operations, not only technology. A contingency plan handles a specific disruption, such as a pandemic sending everyone to work from home. A business continuity plan is broader still, covering how the business keeps doing what it is there to do, and contains contingency plans. Governments call it continuity of operations.
A DR plan covers people (who declares the disaster, who communicates, who coordinates), process (the documented failover and restore steps) and technology (servers, facilities, alternate sites), with capacity planning, platform diversity and testing.
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