How does Azure Backup work ? – Beginner’s Guide

How does Azure Backup work ? – Beginner’s Guide: Azure Backup’s service works to provide data backup to protect your VMs (Azure Virtual Machine) data from an unexpected destruction. With the help of which, you can easily get the Backup of the data of your VMs. Today’s article is about how you can back up your VM’s data through Azure Backup.

How does Azure Backup work ? – Beginner’s Guide

Azure Backup works on the default policy. That is, it works according to the different types of policies made by each user. So, when Azure Backup starts, the task of backing up your data first sends instructions to Azure VM’s extension to take a full snapshot of VM’s disk. And it allows application-compatible snapshots to work without shutting down the virtual machine. After which, the data of the VM is transferred to the Recovery Services Vault.

Do you also want to back up or back up your VM’s data with the help of Azure Backup? So today, we will provide you this information. For this, you have to follow some process which is being told in this article.

Azure Backup work step by step process:

  1. Azure Backup first initiates the backup operation for the selected Azure VMs data, according to the backup schedule set by the user.
  2. If the VM is in its working mode. So at the time of the first Backup, a backup extension is added to the VM. The extensions are different for both Windows and Linux VMs. The VMsnapshotLinux extension is used for Windows VMs and VMsnapshot for Linux VMs.
  3. Backup for Windows VMs Works with Windows VSS (Volume Shadow Copy Service) to take backup VM compatible snapshots.
  • Firstly, it takes the entire VSS backup by default as set by the user.
  • In any case, if this backup app is not able to take compatible snapshots. So, in that case, it takes a file-compatible snapshot of the underlying storage.

4. Azure Backup takes a file-compatible snapshot for Linux VMs running. Note: keep in mind that for this, you have to adapt the postscript manually.

5. After the backup snapshot process is completed, it transfers the data to the vault.

  • Backing up each VM disk in parallel is optimized for its Backup.
  • For each disk being backed up, the process of reading blocks in Azure Backup Disk goes on, i.e., it reads blocks. And then, the new Backup is converted after the previous Backup. It identifies only that.
  • The process of copying snapshot data inside the vault is not instant. If we talk about peak overs, then it can take a few hours. However, it may take less than 24 hours to back up the VM.

6. When Azure Backup is enabled, some changes are seen in the Windows VM described below:

  • The change is that Microsoft Visual C++ 2013 Redistributable(x64) – 12.0.40660 is installed in the VM.
  • Another change is that the startup type of VSS changes from manual to automatic.
  • The third and final change is the addition of the IaaSVmProvider Windows service.

7. When the data is completely transferred, i.e., the data transfer process is completely over. After that, the snapshot taken is deleted. And a new recovery point is created in it.

Encryption of Azure VM backups

  1. SSE
  2. Azure Disk Encryption
  3. Snapshot consistency
  4. Application consistent
  5. file system consistency
  6. crash resistant

Backup and Restore Considerations

1. Disk 2. Scheduling 3. Preparing backups 4. Data transfer 5. Initial backup 6. Restore queue 7. Restore copy

Backup performance

  1. This adds a new disk to the secure Azure VM. When the VM is in its backup process, and during that, a new disc is added. So its backup time increases. During peak overs backup, it may take a few hours. However, backing up a VM can take less than 24 hours.
  2. It works both fast and slow. This backup operation is faster if disk changes are embedded. But if the change is spread on and is in a broken position. So the process of Backup becomes slow.
  3. If the size of the protected disk in the encrypted Backup is above 200 GB, the Backup may take a long time to complete. But if the size is handy, it’s quick.
  4. Some backup versions already exist. But its new version is known as the Instant Restore version. It uses a more optimized process to identify the change. But if you’re using the instant restore version and you’ve deleted the snapshot, it’s switched on, which is not possible during the first version (checksum). In which case, its process takes more than 24 hours.

In the above article, you have been given Azure Backup work and some important information related to it. We hope this important information will prove useful to you.

Updated: December 18, 2021 — 6:28 am

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