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title: About agentless multi-disk crashconsistent backup for Azure Virtual Machines by using Azure Backup
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description: Learn about agentless multi-disk crashconsistent backup for Azure VMs by using Azure Backup via Azure portal.
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title: About agentless multi-disk crash-consistent backup for Azure Virtual Machines by using Azure Backup
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description: Learn about agentless multi-disk crash-consistent backup for Azure VMs by using Azure Backup via Azure portal.
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ms.topic: conceptual
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ms.date: 03/15/2024
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author: AbhishekMallick-MS
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ms.author: v-abhmallick
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---
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# About agentless multi-disk crashconsistent backup for Azure VMs (preview)
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# About agentless multi-disk crash-consistent backup for Azure VMs (preview)
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Azure Backup supports agentless VM backups by using multi-disk crash-consistent restore points (preview). The Enhanced VM backup policy now enables you to configure the consistency type of the backups (application-consistent restore points or crash-consistent restore points preview) for Azure VMs. This feature also enables Azure VM backup to retry the backup operation with *crashconsistent snapshots* (for *supported VMs*) if the application-consistent snapshot fails.
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Azure Backup supports agentless VM backups by using multi-disk crash-consistent restore points (preview). The Enhanced VM backup policy now enables you to configure the consistency type of the backups (application-consistent restore points or crash-consistent restore points (preview) for Azure VMs. This feature also enables Azure VM backup to retry the backup operation with *crash-consistent snapshots* (for *supported VMs*) if the application-consistent snapshot fails.
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## When do I choose crash-consistent backup over application-consistent backup?
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- If your workload is performance sensitive and can tolerate recovery from crash-consistent backups, crash-consistent backups help quiesce VM I/O for shorter period during backup. Crash-consistent backup doesn't use Volume Shadow Copy Service, VSS (for Windows) or fsfreeze (for Linux) to avoid the associated quiescing delays.
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- If your workload is performance sensitive and can tolerate recovery from crash-consistent backups, crash-consistent backups help quiesce VM I/O for a shorter period during backup. Crash-consistent backup doesn't use Volume Shadow Copy Service, (VSS) (for Windows) or *fsfreeze* (for Linux) to avoid the associated quiescing delays.
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- If you don't want to install the VM Agent or snapshot extension required for applicationconsistent or file-systemconsistent snapshots in your Azure VM, use crash-consistent backups for an agentless backup solution.
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- If you don't want to install the VM Agent or snapshot extension required for application-consistent or file-system-consistent snapshots in your Azure VM, use crash-consistent backups for an agentless backup solution.
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- If your operating system is not supported for application or file-systemconsistent backup, use crashconsistent backups. Crash-consistent backup is operating system agnostic as it doesn't rely on the VM agent or snapshot extension.
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- If your operating system is not supported for application or file-system-consistent backup, use crash-consistent backups. Crash-consistent backup is operating system agnostic as it doesn't rely on the VM agent or snapshot extension.
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## When do I not use crash-consistent backups?
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- If your application can't tolerate recovery from crashconsistent backups.
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- If your application can't tolerate recovery from crash-consistent backups.
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- If you use pre/post scripts for Linux VM backups.
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- If you use read/write host caching and your workload is sensitive to cached data not being flushed before backup.
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## Pricing for agentless multi-disk crash-consistent backup
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During preview, Azure VMs backed up with multi-disk crashconsistent type is charged for 0.5 protected instance (PI) and the backup storage consumed.
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During preview, Azure VMs backed up with multi-disk crash-consistent type is charged for 0.5 protected instance (PI) and the backup storage consumed.
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## Supported scenarios for agentless multi-disk crashconsistent VM backup (preview)
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## Supported scenarios for agentless multi-disk crash-consistent VM backup (preview)
>Multi-disk crash consistency might not succeed for disks configured with read or write host caching because writes that occur while the snapshot is taken might not be acknowledged by Azure Storage. If you need to maintain consistency, we recommend that you use the application-consistent backups.
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>Multi-disk crash consistency might not succeed for disks configured with read or write host caching because writes that occur while the snapshot is taken might not be acknowledged by Azure Storage. If you need to maintain consistency, we recommend you to use the application-consistent backups.
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## Next steps
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-[Back up Azure VM with agentless multi-disk crashconsistent backup (preview)](backup-azure-vms-agentless-multi-disk-crash-consistent.md)
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[Back up Azure VM with agentless multi-disk crash-consistent backup (preview)](backup-azure-vms-agentless-multi-disk-crash-consistent.md)
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title: Back up Azure VM with agentless multi-disk crashconsistent backup by using Azure Backup
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description: Learn how to configure backup for Azure VMs with agentless multi-disk crashconsistent backup via Azure portal.
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title: Back up Azure VM with agentless multi-disk crash-consistent backup by using Azure Backup
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description: Learn how to configure backup for Azure VMs with agentless multi-disk crash-consistent backup via Azure portal.
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ms.topic: how-to
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ms.date: 03/15/2024
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ms.date: 03/13/2024
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author: AbhishekMallick-MS
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ms.author: v-abhmallick
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---
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# Back up Azure VM with agentless multi-disk crashconsistent backup (preview)
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# Back up Azure VM with agentless multi-disk crash-consistent backup (preview)
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This article describes how to configure backup for Azure VMs with agentless multi-disk crashconsistent backup (preview) and back up VM by using the Azure portal.
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This article describes how to configure backup for Azure VMs with agentless multi-disk crash-consistent backup (preview) and back up VM by using the Azure portal.
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Azure Backup supports agentless VM backups by using multi-disk crash-consistent restore points (preview). The Enhanced VM backup policy now enables you to configure the consistency type of the backups (application-consistent restore points or crash-consistent restore points preview) for Azure VMs. This feature also enables Azure VM backup to retry the backup operation with *crashconsistent snapshots* (for *supported VMs*) if the application-consistent snapshot fails.
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Azure Backup supports agentless VM backups by using multi-disk crash-consistent restore points (preview). The Enhanced VM backup policy now enables you to configure the consistency type of the backups (application-consistent restore points or crash-consistent restore points preview) for Azure VMs. This feature also enables Azure VM backup to retry the backup operation with *crash-consistent snapshots* (for *supported VMs*) if the application-consistent snapshot fails.
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## Configure backup for a new Azure VM with agentless multi-disk crashconsistent backup
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## Configure backup for a new Azure VM with agentless multi-disk crash-consistent backup
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The agentless crashconsistent backup is available the *Enhanced VM backup policy* only. You need to set *crash-consistent backup* explicitly in this policy because *application/file-systemconsistent backup* is the default setting.
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The agentless crash-consistent backup is available with the *Enhanced VM backup policy* only. You need to set *crash-consistent backup* explicitly in this policy because *application/file-system-consistent backup* is the default setting.
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To configure backup for a new Azure VM with agentless multi-disk crashconsistent backup enabled, [create a Recovery Services vault](backup-create-recovery-services-vault.md#create-a-recovery-services-vault) and follow these steps:
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To configure backup for a new Azure VM with agentless multi-disk crash-consistent backup enabled, [create a Recovery Services vault](backup-create-recovery-services-vault.md#create-a-recovery-services-vault) and follow these steps:
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1. On the **Configure backup** blade, under **Policy sub type**, select **Enhanced** > **Create a new policy**.
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2. On the **Create policy** blade, set the **Consistency type** to **Only crash consistent snapshot (Preview)** to enable *agentless crash consistent backup*.
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3. Select **OK**.
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## Move a VM from application/file-systemconsistent to crashconsistent backup.
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## Move a VM from application/file-system-consistent to crash-consistent backup.
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If you have VMs backed up with Enhanced Policy, you can move them from agent based application/file-systemconsistent backups to agentless crashconsistent backups by:
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If you have VMs backed up with Enhanced Policy, you can move them from agent based application/file-system-consistent backups to agentless crash-consistent backups by:
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- Changing their associated backup policy (recommended)
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- Editing the policy setting directly
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### Option 1: Change the VM backup policy to switch from application/file-systemconsistent backup to crash-consistent backup (recommended)
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### Option 1: Change the VM backup policy to switch from application/file-system-consistent backup to crash-consistent backup (recommended)
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Follow these steps:
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1. Go to a **Recovery Services vault**, and then select **Manage** > **Backup policies** to check the policy for the VMs you want to move to *crash-consistent backup*.
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2. Select the *backup policy*, and then on the **Modify policy** blade, select **Associated Items** to identify the VMs that you want to move to crashconsistent backup.
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2. Select the *backup policy*, and then on the **Modify policy** blade, select **Associated Items** to identify the VMs that you want to move to crash-consistent backup.
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>[!Note]
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>Ensure that the VMs are supported for crash-consistent backups. Learn about the [supported scenarios](backup-azure-vms-agentless-multi-disk-crash-consistent.md#supported-scenarios-for-agentless-multi-disk-crash-consistent-vm-backup-preview).
A **Modifying protection** notification and a **Configure backup** job in your vault for the VM is triggered. Monitor the notification or job to check if the crash-consistent backup policy is added successfully.
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### Option 2: Modify the backup policy to change from application/file-systemconsistent backup to crashconsistent backup
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### Option 2: Modify the backup policy to change from application/file-system-consistent backup to crash-consistent backup
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If you don't want to create a new policy and move specific VMs, edit the **Consistency type** option in the existing policy.
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If you don't want to create a new policy and move only specific VMs, edit the **Consistency type** option in the existing policy.
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Follow these steps:
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## Next steps
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-[Run an on-demand backup of Azure VM](backup-azure-vms-first-look-arm.md#run-a-backup-immediately).
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[Run an on-demand backup of Azure VM](backup-azure-vms-first-look-arm.md#run-a-backup-immediately).
Direct backup of Azure VMs | Back up the entire VM. | For application or file-system consistent backups, no additional agent is needed on the Azure VM. Azure Backup installs and uses an extension to the [Azure VM agent](../virtual-machines/extensions/agent-windows.md) that's running on the VM. <br><br> You can also use agentless crash consistent backups. [Learn more](backup-azure-vms-agentless-multi-disk-crash-consistent-overview.md). | Restore as follows:<br/><br/> - **Create a basic VM**. This is useful if the VM has no special configuration, such as multiple IP addresses.<br/><br/> - **Restore the VM disk**. Restore the disk. Then attach it to an existing VM, or create a new VM from the disk by using PowerShell.<br/><br/> - **Replace the VM disk**. If a VM exists and it uses managed disks (unencrypted), you can restore a disk and use it to replace an existing disk on the VM.<br/><br/> - **Restore specific files or folders**. You can restore files or folders from a VM instead of restoring the entire VM.
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Direct backup of Azure VMs | Back up the entire VM. | For application or file-system consistent backups, no additional agent is needed on the Azure VM. Azure Backup installs and uses an extension to the [Azure VM agent](../virtual-machines/extensions/agent-windows.md) that's running on the VM. <br><br> You can also use agentless crash-consistent backups. [Learn more](backup-azure-vms-agentless-multi-disk-crash-consistent-overview.md). | Restore as follows:<br/><br/> - **Create a basic VM**. This is useful if the VM has no special configuration, such as multiple IP addresses.<br/><br/> - **Restore the VM disk**. Restore the disk. Then attach it to an existing VM, or create a new VM from the disk by using PowerShell.<br/><br/> - **Replace the VM disk**. If a VM exists and it uses managed disks (unencrypted), you can restore a disk and use it to replace an existing disk on the VM.<br/><br/> - **Restore specific files or folders**. You can restore files or folders from a VM instead of restoring the entire VM.
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Direct backup of Azure VMs (Windows only) | Back up specific files, folders, or volumes. | Install the [Azure Recovery Services agent](backup-azure-file-folder-backup-faq.yml).<br/><br/> You can run the MARS agent alongside the backup extension for the Azure VM agent to back up the VM at the file or folder level. | Restore specific files or folders.
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Backup of Azure VMs to the backup server | Back up files, folders, or volumes; system state or bare metal files; and app data to System Center DPM or to Microsoft Azure Backup Server (MABS).<br/><br/> DPM or MABS then backs up to the backup vault. | Install the DPM or MABS protection agent on the VM. The MARS agent is installed on DPM or MABS.| Restore files, folders, or volumes; system state or bare metal files; and app data.
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**Action** | **Support**
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--- | ---
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Back up a VM that's shut down or offline | Supported.<br/><br/> Snapshot is crashconsistent only, not app consistent.
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Back up a VM that's shut down or offline | Supported.<br/><br/> Snapshot is crash-consistent only, not app consistent.
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Back up disks after migrating to managed disks | Supported.<br/><br/> Backup will continue to work. No action is required.
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Back up managed disks after enabling a resource group lock | Not supported.<br/><br/> Azure Backup can't delete the older restore points. Backups will start to fail when the limit of restore points is reached.
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Modify backup policy for a VM | Supported.<br/><br/> The VM will be backed up according to the schedule and retention settings in the new policy. If retention settings are extended, existing recovery points are marked and kept. If they're reduced, existing recovery points will be pruned in the next cleanup job and eventually deleted.
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**Scenario** | **OS support**
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--- | ---
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Back up with the Azure VM agent extension for application-consistent backup | - Windows 11 client (64 bit only) <br/><br/> - Windows 10 client (64 bit only) <br/><br/>- Windows Server 2022 (Datacenter, Datacenter Core, and Standard) <br/><br/>- Windows Server 2019 (Datacenter, Datacenter Core, and Standard) <br/><br/> - Windows Server 2016 (Datacenter, Datacenter Core, and Standard) <br/><br/> - Windows Server 2012 R2 (Datacenter and Standard) <br/><br/> - Windows Server 2012 (Datacenter and Standard) <br/><br/> - Windows Server 2008 R2 (RTM and SP1 Standard) <br/><br/> - Windows Server 2008 (64 bit only) <br><br> Note that *32 bit Operating Systems* aren't supported.
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[Back up Azure VM directly using agentless crash-consistent backup]() | Agentless crashconsistent backups are operating system agnostic.
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[Back up Azure VM directly using agentless crash-consistent backup]() | Agentless crash-consistent backups are operating system agnostic.
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Back up with the MARS agent | [Supported](backup-support-matrix-mars-agent.md#supported-operating-systems) operating systems
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Back up with DPM or MABS | Supported operating systems for backup with [MABS](backup-mabs-protection-matrix.md) and [DPM](/system-center/dpm/dpm-protection-matrix)
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**Action** | **Support**
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--- | ---
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Back up Linux Azure VMs with the Linux Azure VM agent | Supported for file-consistent backup.<br/><br/> Also supported for app-consistent backup that uses [custom scripts](backup-azure-linux-app-consistent.md).<br/><br/> During restore, you can create a new VM, restore a disk and use it to create a VM, or restore a disk and use it to replace a disk on an existing VM. You can also restore individual files and folders.
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[Back up Azure VM directly by using agentless crashconsistent backup]() | Agentless crashconsistent backups are operating system agnostic.
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[Back up Azure VM directly by using agentless crash-consistent backup]() | Agentless crash-consistent backups are operating system agnostic.
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Back up Linux Azure VMs with the MARS agent | Not supported.<br/><br/> The MARS agent can be installed only on Windows machines.
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Back up Linux Azure VMs with DPM or MABS | Not supported.
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Back up Linux Azure VMs with Docker mount points | Currently, Azure Backup doesn't support exclusion of Docker mount points because these are mounted at different paths every time.
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- Agent-based VM backup doesn't support 32-bit operating systems.
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- Other bring-your-own Linux distributions might work as long as the [Azure VM agent for Linux](../virtual-machines/extensions/agent-linux.md) is available on the VM, and as long as Python is supported.
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- Agent-based VM backup doesn't support a proxy-configured Linux VM if it doesn't have Python version 2.7 or later installed.
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- Agentless crashconsistent backups are operating system agnostic and can be used to back up VMs whose operating system isn't supported for agent-based backups.
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- Agentless crash-consistent backups are operating system agnostic and can be used to back up VMs whose operating system isn't supported for agent-based backups.
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- Azure Backup doesn't support backing up Network File System (NFS) files that are mounted from storage, or from any other NFS server, to Linux or Windows machines. It backs up only disks that are locally attached to the VM.
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## Support matrix for managed pre and post scripts for Linux databases
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## Support for agentless multi-disk crashconsistent VM backup (preview)
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## Support for agentless multi-disk crash-consistent VM backup (preview)
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