Disaster recovery is the set of recovery methods, backup systems, and alternate environments used to restore business operations after a major disruption. In cyber security, it covers more than restoring files: it also means recovering servers, identity systems, network routes, and critical applications in a controlled order.
It matters because attackers often aim to make recovery slow or impossible. Ransomware may encrypt production data and backup repositories, while destructive malware can erase systems or corrupt configurations. Good disaster recovery planning reduces downtime and data loss by using offsite backups, replication, tested failover sites, and clear recovery time and recovery point objectives. In practice, defenders use disaster recovery to move workloads to a secondary region, a cloud region, or another data center when primary systems are unavailable. Regular testing is essential, because a recovery plan that has never been exercised often fails under real pressure.