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articles/backup/backup-azure-vms-agentless-multi-disk-crash-consistent-overview.md

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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: 03/13/2024
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ms.date: 03/14/2024
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author: AbhishekMallick-MS
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ms.author: v-abhmallick
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---
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## When do I choose crash-consistent backup over application-consistent backup?
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Choose to perform creah-consistent backup in the following scenarios:
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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 application-consistent or file-system-consistent snapshots in your Azure VM, use crash-consistent backups for an agentless backup solution.
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## When do I not use crash-consistent backups?
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Don't use crash-consistent backups in the following scenarios:
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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.

articles/backup/backup-azure-vms-agentless-multi-disk-crash-consistent.md

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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: 03/13/2024
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ms.date: 03/14/2024
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author: AbhishekMallick-MS
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## Configure backup for a new Azure VM with agentless multi-disk crash-consistent backup
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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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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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>[!Note]
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>The agentless crash-consistent backup is available with the *Enhanced VM backup policy* only.
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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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## 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-system-consistent backups to agentless crash-consistent 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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>[!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-overview.md#supported-scenarios-for-agentless-multi-disk-crash-consistent-vm-backup-preview).
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3. Go to the **Modify policy** blade, and then make a note of the settings in the policy to use the same in the new backup policy.
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3. Go to the **Modify policy**, and then make a note of the settings in the policy to use the same in the new backup policy.
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4. Go to the **Backup policies** blade, and select **Add** to create a new policy.
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1. Go to the *Recovery Services vault*, select **Backup policies**, and then choose an existing policy.
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2. On the **Modify policy** blade, select **Associated Items**.
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2. On the **Modify policy**, select **Associated Items**.
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>[!Note]
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>Ensure that all the VMs in the policy are supported for crash-consistent backups. Learn about the [supported scenarios](backup-azure-vms-agentless-multi-disk-crash-consistent-overview.md#supported-scenarios-for-agentless-multi-disk-crash-consistent-vm-backup-preview).

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