This is the reference Qs from ISACA
To address an organization’s disaster recovery requirements, backup intervals should not exceed the:
A.service level objective.
B.recovery time objective (RTO).
C.recovery point objective (RPO).
D.maximum acceptable outage (MAO).
The answer is D.
ISACA Justification:
The maximum acceptable outage (MAO) is the maximum amount of system downtime that is tolerable. It can be used as a synonym for maximum tolerable period of disruption or maximum allowable downtime. However, the RTO denotes an objective/target, while the MAO constitutes a vital necessity for an organization’s survival.
The restoration speed of a backup system directly influences the organization's ability to meet its RTO. A backup solution with faster restoration speeds can help minimize downtime and ensure that critical systems and data are recovered within the specified RTO.
While the Recovery Point Objective (RPO) (option B) is also an important consideration in backup system selection, it primarily relates to the acceptable data loss tolerance in the event of a disruption, rather than the speed of system restoration.
The question tries to trick you with the words "different restoration speeds", backups are related to RPO.
Remember you can measure RPO based on timeline allowed for data loss i.e 0-1 hour time lag would require mirroring/real time replication as compared to 4- 24 hour time lag where you can use tape backups will have slower restoration speed for data lost.
The recovery time objective (RTO) specifies the maximum elapsed time to recover an application at an alternate site. The greater the RTO, the longer the process can take to be restored.
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