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Bacula Storage Daemon
Bacula Storage Daemon is the storage management service in the Bacula open-source backup software suite. It handles the reading and writing of backup data to and from physical or virtual storage devices, acting as the critical intermediary between backup jobs and data repositories..
Bacula Storage Daemon (SD) is a core component within the Bacula enterprise backup system, responsible for direct communication with backup storage hardware. It manages write and retrieval operations during backup and restore processes, ensuring the integrity and consistency of the data streams. The SD receives data from Bacula's Director and stores it onto configured media such as disk-based storage, tape libraries, or other devices.
The Storage Daemon supports various storage devices and media formats, enabling flexible deployment scenarios. It utilizes defined device resources and media pools for organizing data, optimizing backup workflows, and minimizing storage overhead. Advanced features include volume spanning, media recycling, and automated tape handling which enhance the managerial capabilities of enterprise-level data protection.
Operationally, the SD listens on port 9103 (by default) for connections initiated by the Director. The communication protocol is designed to be efficient and facilitate large data transmissions, optionally supporting encryption and authentication when configured to enhance security. Bacula’s modular architecture allows admins to scale storage resources independently, with multiple Storage Daemons managing different or distributed repositories.