RAID, or Redundant Array of Independent Disks, is a storage method that combines multiple drives into one logical system. Depending on the level used, it can improve speed, increase availability, or mirror data so a single disk failure does not immediately stop access. RAID is common in servers, NAS devices, and external arrays because it helps keep services running under load.
In cyber security, RAID matters because resilience is often mistaken for backup. RAID can reduce downtime after hardware failure, but it does not protect against ransomware, accidental deletion, corruption, or a failed controller. Attackers may target storage infrastructure to disrupt recovery or make data unavailable, while defenders use RAID to keep logs, archives, and business systems online during disk failures. Good practice still requires tested backups, because RAID is about continuity, not data preservation.