1. **Back up your data.** Create [full backups](../../relational-databases/backup-restore/create-a-full-database-backup-sql-server.md) of all databases. The `master` database contains all system level information for the instance, such as logins, and schemas. The `msdb` database contains job information such as [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] Agent jobs, backup history, and maintenance plans. For more information about system databases, see [System databases](../../relational-databases/backup-restore/back-up-and-restore-of-system-databases-sql-server.md).
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