Recovery point objective (RPO) - It determines the maximum age of files that must be recovered from backup storage for normal operations to resume without significant losses., Recovery time objective (RTO) - the targeted duration of time and a service level within which a business process must be restored after a disaster or disruption to avoid unacceptable consequences associated with a break in business continuity., Mean time to repair (MTTR) - the average time required to repair a failed component or device and return it to normal operations., Mean time between failures (MTBF) - calculated average time between failures of a system or component during its operational lifespan. A higher MTBF suggests greater reliability and stability, cold site - most affordable but take the most time to recover. Contains no equipment, connections, or data. Days to weeks to recover, warm site - are more expensive than cold sites but offer faster recovery. Contains some equipment, and connections, but out of date configurations and data sets. Hours to days to recover, Hot site - are the most expensive but offer the fastest recovery time. Contacts all equipment, connections, and recent configurations and data sets. Minutes to hours to recover, Active-active - configuration, both systems run simultaneously, distributing the load to maximize performance and availability., Active-passive - setup, one system is operational while the other stands by, ready to take over in case the primary system fails, ensuring continuity but with potential downtime during the switchover., Testing - critical component of disaster recovery planning, ensuring that recovery procedures are effective and up-to-date, Tabletop exercises - are discussion-based sessions where team members walk through various disaster scenarios to evaluate the effectiveness of the disaster recovery plan., Validation tests - involve the actual execution of the disaster recovery processes to verify that systems and data can be restored in accordance with the recovery objectives.,

3.3 disaster recovery concepts

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