Backups and recovery sites are how an organization survives events that redundancy cannot handle: ransomware, accidental deletion, corruption, fire, flood or the loss of an entire data center. Planning starts with a business impact analysis (BIA), which identifies critical processes and how much downtime and data loss the business can tolerate. Those tolerances become recovery objectives, and the objectives decide which backup methods and recovery sites are worth paying for. Security+ tests the terminology precisely, so learn the definitions carefully.
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