Calculation of the recovery time objective (RTO) is necessary to determine the:

The recovery time objective (RTO) is a metric that defines the maximum acceptable time frame for restoring a system or service after a disruption. The RTO is determined by the business impact and requirements of the system or service, as well as the risk appetite and tolerance of the organization. The calculation of the RTO is necessary to determine the priority of restoration,which means the order and urgency of recovering the systems or services based on their criticality and dependency. The priority of restoration helps to optimize the use of resources and minimize the downtime and losses during a disaster recovery. The other options are not the correct answers, as they are not the main purpose of calculating the RTO. The time required to restore files is a factor that affects the RTO, but it is not the outcome of the RTO calculation. The point of synchronization is the point in time to which the data must be restored to ensure consistency and accuracy. The point of synchronization is related to the recovery point objective (RPO), not the RTO. The annual loss expectancy (ALE) is a measure of the expected loss peryear due to a specific risk or threat. The ALE is calculated by multiplying the single loss expectancy (SLE) by the annualized rate of occurrence (ARO). The ALE is not directly related to the RTO, although it may influence the RTO determination. References = Recovery Time Objective (RTO) - What Is It, Examples, Calculation; CRISC Review Manual, pages 197-1981; CRISC Review Questions, Answers & Explanations Manual, page 842