The metric in question is the Recovery Time Objective, which sets the maximum amount of time that a process can be down after a disruption before significantly impacting the organization. It is essential for creating effective disaster recovery strategies. While redundancy is a strategy that may help achieve a lower RTO by having backup systems, it is not a metric. Availability represents the proportion of time a system is operational, and Service Level Agreements establish the expected performance and availability standards between providers and clients, but neither directly defines the maximum tolerable downtime after a disruption.