4.3. Disaster Recovery Concepts

💡 First Principle: Disasters will happen—hardware fails, software corrupts data, natural disasters destroy facilities, humans make mistakes. Disaster recovery planning ensures that when (not if) failures occur, the organization recovers within acceptable time and data loss limits.

What breaks without DR planning? Ransomware encrypts production servers—without tested backups and recovery procedures, you pay the ransom or lose everything. A data center floods—without a recovery site, operations cease until the facility rebuilds (months). A critical admin leaves—without documented runbooks, recovery takes ten times longer.

Think of DR like insurance and fire drills: you hope to never need them, but when you do, preparation determines whether you recover in hours or close the business.