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AbhishekMallick01
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Addressed EEE doc ask #26863025
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articles/backup/backup-azure-vm-backup-faq.yml

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description: In this article, discover answers to common questions about backing up Azure VMs with the Azure Backup service.
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ms.topic: faq
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ms.service: azure-backup
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ms.date: 11/30/2024
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ms.date: 01/30/2025
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author: AbhishekMallick-MS
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ms.author: v-abhmallick
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- question: Will a new disk added to VM be backed up automatically?
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Yes, a new disk added to a VM will be backed up automatically during the next backup, unless selective disk backup is configured on the VM. A newly added disks to the VM will have a Full snapshot (Initial Replica) taken on the first backup, the existing disks will continue the Incremental logic chain.
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Yes, a new disk added to a VM will be backed up automatically during the next backup, unless selective disk backup is configured on the VM. A newly added disk to the VM will have a Full snapshot (Initial Replica) taken on the first backup, the existing disks will continue the Incremental logic chain.
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- question: Can I restore the files and folders from an encrypted VM backup?
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Storage spaces in a single VM not supported for application consistent VM backup. For application consistent VM backup, VSS freezes the I/O and ensures that disk snapshots are consistent. Storage Spaces can still perform writes in the background, breaking the application consistent guarantee. This can result in a small probability that the backup taken is not application consistent. Today, backup and recovery of VM with storage spaces is not blocked in the product.
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- question: If I remove one of the disks from VM and increase the size of existing disk,what happens to the backups and if next backup create Full Backup for all disk?
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- question: If I remove one of the disks from VM and increase the size of existing disk, what happens to the backups and if next backup creates Full Backup for all disk?
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Removing a disk, will simply not run any snapshot or data transfer for the removed disk. Number of disks included in the restore point will differ depending on the VM state at the time of the backup.
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If you remove a disk, the snapshot or data transfer operations won't run for the removed disk. Number of disks included in the restore point will differ depending on the VM state at the time of the backup.
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Resizing a disk will continue with incremental backups unless the underlying storage account of the disk changes, which results in a full backup.
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- question: If backup fails with time out error for large disk VMs after running sometime, when can I re-trigger the backup job again and will the backup continue from where it failed?
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For Initial Replica, a full backup will be re-initiated in case of failure. However, for Incremental the snapshot from the last successful backup will be compared to the latest snapshot to copy the changed data into the vault.
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- question: Why SSD V2 with GRS Vaults/Cross Region Restore is currently not supported?
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The Geo-redundant storage (GRS) support will be enabled once Premium SSD v2 is available in all regions. This is because the paired regions need to be supported to copy the data.

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