SQL Server maintains a set of system-level databases, system databases, which are essential for the operation of a server instance. Several of the system databases must be backed up after every significant update. The system databases that you must always back up include msdb, master, and model. If any database uses replication on the server instance, there is a distribution system database that you must also back up. Backups of these system databases let you restore and recover the SQL Server system in the event of system failure, such as the loss of a hard disk.
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