Summit CPA Review
ISC Business Continuity · Updated November 2026

RTO vs RPO vs Maximum Tolerable Downtime

RTO is restore time, RPO is tolerated data loss, and MTD is the outer downtime limit.

RTO

Recovery time objective is the target time to restore a process or system.

RPO

Recovery point objective is the maximum acceptable data-loss window.

MTD

Maximum tolerable downtime is the longest outage the business can endure.

Exam strategy

Restore time equals RTO; data loss equals RPO; outer tolerance equals MTD.

The takeaway

RTO measures restoration time, RPO measures data loss, and MTD measures maximum tolerated outage.

Related Summit resources

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FAQ

Is RPO restoration time?

No.

Is RTO restoration time?

Yes.

Is MTD the outer downtime tolerance?

Yes.