The correct metric is RTO (Recovery Time Objective). RTO defines the maximum acceptable time to restore services after a disruption, ensuring business continuity. For example, if the RTO is 4 hours, systems must be back online within that timeframe after an outage.
B. MTBF (Mean Time Between Failures) measures reliability by calculating the average time between hardware failures.
C. RPO (Recovery Point Objective) defines how much data loss (in terms of time, such as last backup point) is acceptable.
D. MTTR (Mean Time to Repair) measures the average time taken to fix a failure but is not a predefined business requirement like RTO.
Organizations define RTOs during disaster recovery planning to align IT recovery capabilities with business needs.
References (CompTIA Network+ N10-009):
Domain: Networking Concepts — Business continuity metrics (RTO, RPO, MTBF, MTTR).
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