What is disaster recovery, and why does it matter?
Disaster recovery is the set of processes that brings systems back online after an unexpected outage or disaster. That is why businesses treat it as a critical protection layer. It is not only for large enterprises. Smaller companies use it for business continuity as well.
For a short overview, see the disaster recovery page.
A disaster recovery plan and its main parts
A disaster recovery plan states how systems are protected and how they are restored. The plan covers process, technology, and people together. The main parts are:
- Classify critical applications and data
- Set the backup approach
- Test recovery scenarios on a schedule
- Make responsibilities clear
A written plan replaces panic with a controlled return to service.
For the planning steps, read the disaster recovery plan page.
RTO and RPO
RTO (Recovery Time Objective) is how quickly a system must be back in service. RPO (Recovery Point Objective) is how much data loss is acceptable, measured in time. Without those targets, choosing a recovery design is guesswork. The sector and the operation set the numbers.
RTO and RPO are also covered on the service page.
Recovery site models
A disaster recovery site can be built in more than one way. A hot site, a warm site, and a cold site trade cost against speed. Cloud-based disaster recovery is the more flexible option when you need to scale.
Compare the models on the infrastructure section.
What disaster recovery changes
- It strengthens business continuity
- It supports customer trust
- It makes regulatory compliance easier to show
- It reduces operational risk
Those results depend on testing. A plan that is never tested will surprise you in a real incident.
See the full list on the solution page.
When disaster recovery is required
Disaster recovery becomes critical in cases such as:
- Finance and e-commerce, where downtime is expensive
- Applications that hold a large volume of data
- Platforms that must stay online 24/7
- Organizations with a regulatory duty to recover
Decide after a risk review, not before one.
More examples are on the use-case section.
Further reading
If you want another source:
In short
Disaster recovery is part of business continuity and data protection. Planning and regular tests keep losses smaller when an incident happens.
Frequently asked questions
Short answers to the questions this article is most often asked.
1 Are RTO and RPO the same?
No. RTO is how quickly the system must be back in service. RPO is how much data loss, measured in time, is acceptable.
2 Does a disaster recovery plan need testing?
Yes. A plan that is never tested will surprise you in a real outage. Recovery scenarios should be run on a schedule.
3 Is disaster recovery only for large companies?
No. Any business that cannot afford a long outage, including smaller companies, uses it for business continuity.