Limitations for Restore to Microsoft Azure
When planning to restore workloads to Microsoft Azure, mind the following general limitations:
- Veeam Backup & Replication supports restore to Microsoft Azure for the following workloads:
- Microsoft Windows workloads that run Windows Server 2008/Windows Vista and later.
- Linux workloads (see the Supported Distributions & Versions section in Microsoft Docs).
We strongly recommend to have dracut and mkinitrd installed on Linux machines that will be restored to Azure. Otherwise, they may not boot after restore.
- When you select a storage account whose resources you want to use to store disks of the restored workload, mind the following:
- Storage accounts with the ZRS or GZRS replication options are not supported. For details, see Microsoft Docs.
- If you plan to use a premium storage account and want to store unmanaged disks there, the restore speed for such disks will be limited to 30 MB/s (approximately).
- [Azure VMs] Veeam Backup & Replication does not support restore of Azure Ultra Disks.
- [Azure VMs] Mind the following limitations for disk sizes:
- [Unmanaged VM disks] Veeam Backup & Replication supports restoring of disks equal to or less than 4093 GB. This is due to the following reasons: VM disks can increase in size up to 2 GB because of conversion during the restore process; Azure supports disk up to 4095 GB. For more information on all disk sizes that Azure supports, see Microsoft Docs.
- [Managed VM disks] Veeam Backup & Replication supports restoring disks equal or less than 4093 GB for OS disks and equal to or less than 32765 GB for other disks. During the restore process, VM disks can increase in size up to 2 GB because of conversion. For more information on all managed disk sizes that Azure supports, see Microsoft Docs. For more information on OS disk size that Azure supports, see Microsoft Docs. Note that supported disk sizes for Azure and Veeam Backup & Replication differ.
The price of a restored VM disk can become higher because of the increase in disk size during the restore process. For more information on pricing, see Managed Disks pricing and Unmanaged Disk and Page Blob pricing.
- [Azure Stack VMs] Veeam Backup & Replication supports restoring of managed and unmanaged disks equal to or less than 1021 GB. This is due to the following reasons: VM disks can increase in size up to 2 GB because of conversion during the restore process; Azure Stack supports disk up to 1023 GB. For more information on all disk sizes that Azure supports, see Microsoft Docs.
You can change the maximum supported size for unmanaged VM disks with a registry key. For more information, contact Veeam Customer Support.
The price of a restored VM disk can become higher because of the increase in disk size during the restore process. For more information on pricing, see Azure Stack Hub Pricing.
- If the system disk of an initial workload uses the GPT partitioning scheme, the number of partitions on the disk cannot exceed 4. During restore such disk will be converted to a disk with the MBR partitioning scheme.
- The restore to Microsoft Azure functionality does not support the Azure Hybrid Use Benefit program.
- [For restore from backups created with Veeam Agent for Microsoft Windows] Workloads from a backup that contains a failover cluster are restored as separate VMs, not as a cluster. Shared cluster disks of these VMs are restored as regular disks.
Requirements and Limitations for Generation 2 VM Support
Before enabling Generation 2 VM support, mind the following requirements and limitations:
- When you select VM sizes at the Specify VM Size step of the Restore to Azure wizard, make sure that the selected size is compatible with Generation 2 VMs.
- Generation 2 VMs support only managed disks. Thus, you will need to select the managed storage type from the Storage type list at the Specify VM Size step of the Restore to Azure wizard.
- Make sure that OSes of backed-up workloads that you plan to restore have UEFI boot. Otherwise, the restored VMs may be unbootable.