Back up Azure VMs in a Recovery Services vault
This article describes how to back up Azure VMs in a Recovery Services vault, using the Azure Backup service.
In this article, you learn how to:
- Prepare Azure VMs.
- Create a vault.
- Discover VMs and configure a backup policy.
- Enable backup for Azure VMs.
- Run the initial backup.
This article describes how to set up a vault and select VMs to back up. It's useful if you want to back up multiple VMs. Alternatively, you can back up a single Azure VM directly from the VM settings.
Before you start
- Review the Azure VM backup architecture.
- Learn about Azure VM backup, and the backup extension.
- Review the support matrix before you configure backup.
In addition, there are a couple of things that you might need to do in some circumstances:
- Install the VM agent on the VM: Azure Backup backs up Azure VMs by installing an extension to the Azure VM agent running on the machine. If your VM was created from an Azure marketplace image, the agent is installed and running. If you create a custom VM, or you migrate an on-premises machine, you might need to install the agent manually.
Create a vault
A vault stores backups and recovery points created over time, and stores backup policies associated with backed up machines. Create a vault as follows:
Sign in to the Azure portal.
In search, type Recovery Services. Under Services, click Recovery Services vaults.
In Recovery Services vaults menu, click +Add.
In Recovery Services vault, type in a friendly name to identify the vault.
- The name needs to be unique for the Azure subscription.
- It can contain 2 to 50 characters.
- It must start with a letter, and it can contain only letters, numbers, and hyphens.
Select the Azure subscription, resource group, and geographic region in which the vault should be created. Then click Create.
- It can take a while for the vault to be created.
- Monitor the status notifications in the upper-right area of the portal.
After the vault is created, it appears in the Recovery Services vaults list. If you don't see your vault, select Refresh.
Azure Backup now allows customization of the resource group name created by the Azure Backup service. For more information, see Azure Backup resource group for Virtual Machines.
Modify storage replication
By default, vaults use geo-redundant storage (GRS).
- If the vault is your primary backup mechanism, we recommend you use GRS.
- You can use locally-redundant storage (LRS) for a cheaper option.
Modify storage replication type as follows:
In the new vault, click Properties in the Settings section.
In Properties, under Backup Configuration, click Update.
Select the storage replication type, and click Save.
You can't modify the storage replication type after the vault is set up and contains backup items. If you want to do this you need to recreate the vault.
Apply a backup policy
Configure a backup policy for the vault.
In the vault, click +Backup in the Overview section.
In Backup Goal > Where is your workload running? select Azure. In What do you want to back up? select Virtual machine > OK. This registers the VM extension in the vault.
In Backup policy, select the policy that you want to associate with the vault.
The default policy backs up the VM once a day. The daily backups are retained for 30 days. Instant recovery snapshots are retained for two days.
If you don't want to use the default policy, select Create New, and create a custom policy as described in the next procedure.
In Select virtual machines, select the VMs you want to back up using the policy. Then click OK.
The selected VMs are validated.
You can only select VMs in the same region as the vault.
VMs can only be backed up in a single vault.
In Backup, click Enable backup. This deploys the policy to the vault and to the VMs, and installs the backup extension on the VM agent running on the Azure VM.
After enabling backup:
- The Backup service installs the backup extension whether or not the VM is running.
- An initial backup will run in accordance with your backup schedule.
- When backups run, note that:
- A VM that's running have the greatest chance for capturing an application-consistent recovery point.
- However, even if the VM is turned off it's backed up. Such a VM is known as an offline VM. In this case, the recovery point will be crash-consistent.
- Explicit outbound connectivity is not required to allow backup of Azure VMs.
Create a custom policy
If you selected to create a new backup policy, fill in the policy settings.
In Policy name, specify a meaningful name.
In Backup schedule, specify when backups should be taken. You can take daily or weekly backups for Azure VMs.
In Instant Restore, specify how long you want to retain snapshots locally for instant restore.
- When you restore, backed up VM disks are copied from storage, across the network to the recovery storage location. With instant restore, you can leverage locally-stored snapshots taken during a backup job, without waiting for backup data to be transferred to the vault.
- You can retain snapshots for instant restore for between one to five days. Two days is the default setting.
In Retention range, specify how long you want to keep your daily or weekly backup points.
In Retention of monthly backup point, specify whether you want to keep a monthly backup of your daily or weekly backups.
Click OK to save the policy.
Azure Backup doesn't support automatic clock adjustment for daylight-saving changes for Azure VM backups. As time changes occur, modify backup policies manually as required.
Trigger the initial backup
The initial backup will run in accordance with the schedule, but you can run it immediately as follows:
- In the vault menu, click Backup items.
- In Backup Items, click Azure Virtual Machine.
- In the Backup Items list, click the ellipses (...).
- Click Backup now.
- In Backup Now, use the calendar control to select the last day that the recovery point should be retained. Then click OK.
- Monitor the portal notifications. You can monitor the job progress in the vault dashboard > Backup Jobs > In progress. Depending on the size of your VM, creating the initial backup may take a while.
Verify Backup job status
The Backup job details for each VM backup consist of two phases, the Snapshot phase followed by the Transfer data to vault phase.
The snapshot phase guarantees the availability of a recovery point stored along with the disks for Instant Restores and are available for a maximum of five days depending on the snapshot retention configured by the user. Transfer data to vault creates a recovery point in the vault for long-term retention. Transfer data to vault only starts after the snapshot phase is completed.
There are two Sub Tasks running at the backend, one for front-end backup job that can be checked from the Backup Job details blade as given below:
The Transfer data to vault phase can take multiple days to complete depending on the size of the disks, churn per disk and several other factors.
Job status can vary depending on the following scenarios:
|Snapshot||Transfer data to vault||Job Status|
|Completed||In progress||In progress|
|Completed||Failed||Completed with warning|
Now with this capability, for the same VM, two backups can run in parallel, but in either phase (snapshot, transfer data to vault) only one sub task can be running. So in scenarios were a backup job in progress resulted in the next day’s backup to fail will be avoided with this decoupling functionality. Subsequent day’s backups can have snapshot completed while Transfer data to vault skipped if an earlier day’s backup job is in progress state. The incremental recovery point created in the vault will capture all the churn from the last recovery point created in the vault. There is no cost impact on the user.
Install the VM agent
Azure Backup backs up Azure VMs by installing an extension to the Azure VM agent running on the machine. If your VM was created from an Azure Marketplace image, the agent is installed and running. If you create a custom VM, or you migrate an on-premises machine, you might need to install the agent manually, as summarized in the table.
|Windows||1. Download and install the agent MSI file.
2. Install with admin permissions on the machine.
3. Verify the installation. In C:\WindowsAzure\Packages on the VM, right-click WaAppAgent.exe > Properties. On the Details tab, Product Version should be 2.6.1198.718 or higher.
If you're updating the agent, make sure that no backup operations are running, and reinstall the agent.
|Linux||Install by using an RPM or a DEB package from your distribution's package repository. This is the preferred method for installing and upgrading the Azure Linux agent. All the endorsed distribution providers integrate the Azure Linux agent package into their images and repositories. The agent is available on GitHub, but we don't recommend installing from there.
If you're updating the agent, make sure no backup operations are running, and update the binaries.
Azure Backup now supports selective disk backup and restore using the Azure Virtual Machine backup solution.
Today, Azure Backup supports backing up all the disks (Operating System and data) in a VM together using the Virtual Machine backup solution. With exclude-disk functionality, you get an option to backup one or a few from the many data disks in a VM. This provides an efficient and cost-effective solution for your backup and restore needs. Each recovery point contains data of the disks included in the backup operation, which further allows you to have a subset of disks restored from the given recovery point during the restore operation. This applies to restore both from the snapshot and the vault.
This solution is particularly useful in the following scenarios:
- You have critical data to be backed up in only one disk and you don’t want to back up the rest of the disks attached to a VM. This minimizes the backup storage costs.
- You have other backup solutions for part of your VM data. For example, you back up your databases or data with a different workload backup solution, and you want to use Azure VM level backup for the rest of your disks and data to build an efficient and robust system utilizing the best capabilities available.
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