RTO (recovery time objective)
Also called recovery time objective.
How long a system can stay down after a failure before the outage seriously harms the business.
Last updated
What it is.
NIST defines RTO as the overall length of time a system's components can be in the recovery phase before negatively affecting the organisation's mission. Put simply: the deadline for getting the service back.
RTO is about time; RPO is about data. A system can have a short RTO and a long RPO, or the other way round. A one-hour RTO usually needs automated failover or a rehearsed restore; a three-day RTO can rely on rebuilding from backups.
Why it matters
Every minute of downtime has a cost: lost sales, staff who cannot work, missed SLA credits. A clear RTO tells the team how much to invest in redundancy and how fast the recovery steps must be.
In a product build
RTO shapes hosting, the deploy and rollback setup, and the runbook that goes into the handover pack at the end of a build.
Common mistakes.
- 01
Choosing an RTO the architecture cannot meet, and finding out during an outage.
- 02
Counting only the restore time, not the time to notice, decide and check the data.
- 03
No written runbook, so recovery depends on one person being awake.
Read the official text.
Primary sources this definition is based on.
- NIST CSRC glossary: recovery time objectivechecked 2026-10-25
Related terms.
- RPO (recovery point objective)The point in time to which data must be recoverable after an outage: in practice, how much recent data you can afford to lose.
- UptimeThe share of time a service is working and reachable, usually written as a percentage such as 99.9%.
- SLA (service level agreement)A contract that promises a level of service, such as uptime or support response time, and says what happens if it is missed.
- SLO (service level objective)An internal reliability target for a service, such as 99.9% of requests succeeding, measured by a service level indicator (SLI).
Guides and pages
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