RTO — IT definition
Recovery Time Objective: the maximum acceptable length of time a service can be down after an incident before the business impact becomes critical. It is the target time to restore service after a disaster.
The RTO (Recovery Time Objective) is the maximum acceptable time between a disruption and the return to an operational service. It answers a simple question: "how long can we go without this service before the impact becomes unbearable?"
Together with the RPO, the RTO is one of the two metrics that underpin any Disaster Recovery Plan (DRP) and that are committed to in SLAs.
How to set an RTO
The RTO is determined application by application during the Business Impact Analysis (BIA) of the BCP. The more critical a service, the shorter its RTO:
- •Minutes: e-commerce site, payment system, real-time messaging.
- •Hours: ERP, CRM, back-office business applications.
- •Days: secondary internal tools, non-urgent reporting.
RTO and cost
The RTO is the main cost driver of a DRP: targeting a 5-minute RTO (automated failover, active-active infrastructure) costs several times more than a multi-hour RTO (restore from backup). The goal is to align the RTO with actual criticality, without over-investing in non-essential services.
RTO vs RPO
The RTO measures a recovery time; the RPO measures an acceptable data loss. A service may tolerate a long outage (high RTO) while accepting no data loss (near-zero RPO), or the other way around.
Frequently asked questions
What is the difference between RTO and RPO?
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The RTO (Recovery Time Objective) is the maximum time to restore a service after an outage. The RPO (Recovery Point Objective) is the maximum amount of data you can afford to lose, expressed as a time span. RTO is measured in downtime duration, RPO in data lost since the last usable backup.
How do I define the right RTO?
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The RTO is set during the Business Impact Analysis (BIA), application by application, based on how critical the service is. A revenue-generating real-time service requires an RTO of a few minutes, while a secondary internal tool may tolerate several days. The RTO directly drives the cost of the recovery architecture.
All terms
5R Method
A strategy used during application rationalization to determine the best approach for managing applications.
8R Method
An extended version of the 5R method used in application portfolio management and migration strategies.
Application
A computer program or set of programs designed to automate a business process or deliver value to end users.
Architecture
Refers to the structure and behavior of IT systems, processes, and infrastructure within an organization.
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