A security analyst is updating a BIA document. The security analyst notices the support vendor's time to replace a server hard drive went from eight hours to two hours. Given these new metrics…

MTTR (Mean Time To Repair) measures the average time required to restore a failed component; since the vendor's replacement time dropped from 8 hours to 2 hours, the MTTR is now faster, reflecting a more efficient repair process.

MTTR being slower is incorrect because the repair time was reduced from 8 hours to 2 hours, which by definition makes MTTR faster, not slower.

RTO increasing is incorrect because a shorter replacement time reduces the time needed to recover, which decreases (not increases) the effective RTO.

RTO (Recovery Time Objective) defines the maximum acceptable time to restore a system after a failure; with the hard drive replacement now taking only 2 hours instead of 8, the actual recovery time has decreased, meaning the organization can more easily meet or reduce its RTO target.

MTTF (Mean Time To Failure) measures the average time a component operates before failing, which is a reliability metric unrelated to repair or replacement speed and is not affected by vendor service time changes.

MTTF decreasing is also incorrect because the vendor's repair time has no bearing on how long a hard drive operates before it fails; MTTF is determined by hardware reliability, not servicing speed.