Disaster recovery recovery time objectives (RTOs) are directly derived from the maximum tolerable downtime (MTD) established during the business impact analysis (BIA). According to the CISA Review Manual and Sybex Study Guide materials:
MTD represents the "maximum period that critical business processes can remain disrupted before the organization faces irreparable harm".
RTO is defined as "the maximum period that elapses from the onset of a disaster until the resumption of service"1. The Sybex Study Guide explicitly states:
"The maximum tolerable downtime (MTD) is established for each critical business process. This drives the development of recovery targets (RTO, RPO)"
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