-**Replace existing** | You can restore a disk, and use it to replace a disk on the existing VM.<br/><br/> The current VM must exist. If it's been deleted, this option can't be used.<br/><br/> Azure Backup takes a snapshot of the existing VM before replacing the disk, and stores it in the staging location you specify. Existing disks connected to the VM are replaced with the selected restore point.<br/><br/> The snapshot is copied to the vault, and retained in accordance with the retention policy. <br/><br/> After the replace disk operation, the original disk is retained in the resource group. You can choose to manually delete the original disks if they are not needed. <br/><br/>Replace existing is supported for unencrypted managed VMs. It's not supported for unmanaged disks, [generalized VMs](https://docs.microsoft.com/azure/virtual-machines/windows/capture-image-resource), or for VMs [created using custom images](https://azure.microsoft.com/resources/videos/create-a-custom-virtual-machine-image-in-azure-resource-manager-with-powershell/).<br/><br/> If the restore point has more or less disks than the current VM, then the number of disks in the restore point will only reflect the VM configuration.
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