This document discusses Exchange server backup and recovery. It describes the different types of backup methods for Exchange servers, including online and offline backups. Online backups can be normal, copy, incremental, or detrimental backups while the server is running. Offline backups are performed when Exchange services are shut down. The document also covers the limitations of the built-in backup utilities and how third-party recovery software like SysTools Exchange Backup Recovery can help recover corrupted backup files.