Differences between RTO, RPO, MTBF, and MTFF

Here is a quick overview of the differences between, RTO, RPO, MTBF, and MTFF.

RTO (Recovery Time Objective)Time it takes to recover from a disruption, system failure, data loss etc.
RPO (Recovery Point Objective)How much data can you afford to loose? If RPO is 24 hours, then backups need to be performed daily.
MTBF (Mean Time Between Failures)Time between failures. Use for repairable systems
MTTF (Mean Time to Failure)Time before system fails. Use for nor repairable systems.