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Copy file name to clipboardExpand all lines: articles/backup/backup-azure-sql-mabs.md
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title: Back up SQL Server by using Azure Backup Server
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description: In this article, learn the configuration to back up SQL Server databases by using Microsoft Azure Backup Server (MABS).
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ms.topic: how-to
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ms.date: 03/17/2024
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ms.date: 03/25/2025
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author: jyothisuri
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ms.author: jsuri
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ms.service: azure-backup
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## Prerequisites and limitations
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Before you begin, review the following prerequisites and limitations:
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* If you have a database with files on a remote file share, protection will fail with Error ID 104. MABS doesn't support protection for SQL Server data on a remote file share.
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* Ensure that you've [installed and prepared Azure Backup Server](backup-azure-microsoft-azure-backup.md).
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* MABS can't protect databases that are stored on remote SMB shares.
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* Ensure that the [availability group replicas are configured as read-only](/sql/database-engine/availability-groups/windows/configure-read-only-access-on-an-availability-replica-sql-server).
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* You must explicitly add the system account **NTAuthority\System** to the Sysadmin group on SQL Server.
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* SQL server 2014 added a new feature to create a [database for on-premises SQL Server in Windows Azure Blob storage](/sql/relational-databases/databases/sql-server-data-files-in-microsoft-azure). MABS can't be used to protect this configuration.
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* There are some known issues with "Prefer secondary" backup preference for the SQL Always On option. MABS always takes a backup from secondary. If no secondary can be found, then the backup fails.
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## Before you start
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Before you begin, ensure that you've [installed and prepared Azure Backup Server](backup-azure-microsoft-azure-backup.md).
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## Create a backup policy
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To protect SQL Server databases in Azure, first create a backup policy:
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