A backup service is a system that creates and stores recoverable copies of data so it can be restored after loss, corruption, deletion, or a security incident. Good backup design protects both files and the restore process itself, using controls such as access restrictions, versioning, encryption, and separate storage locations.
In cyber security, backup services are a core part of resilience. Ransomware operators often try to delete, encrypt, or disable backups before launching encryption, because destroying recovery options increases pressure on the victim. Defenders therefore monitor backup jobs, service status, and administrative changes, and they keep offline or immutable copies where possible. A healthy backup service can turn a major incident from a business-ending event into a manageable recovery effort.