A hot site is a fully operational backup facility that mirrors the primary environment in real time, with identical hardware, software, network connectivity, and data. Operations can switch to the hot site within minutes or hours — sometimes automatically. Hot sites provide the fastest possible recovery but carry the highest ongoing cost.
Financial institutions, healthcare systems, and other organizations with extremely low Recovery Time Objectives use hot sites because even brief outages cause unacceptable harm. Cloud infrastructure has made hot site concepts more accessible through standby environments in different cloud regions.
CISSP Relevance
Hot sites appear in Domain 7 (Security Operations) within business continuity and disaster recovery planning. CISSP candidates must understand the cost-recovery speed tradeoff between hot, warm, and cold sites and how Recovery Time Objectives drive the selection of recovery facility type.
External reference: NIST SP 800-34 Contingency Planning Guide for Federal Information Systems
Related terms: Cold Site, Disaster Recovery