what is the difference between disk backup and virtual machine backup along with disks?

Question

I am aware while VM backup is being performed all the disks attached to it will be backed up(pls correct me if i am wrong) automatically, but i can see we can take backup of individual disk from the portal (azure disk service). My question is what is the point in taking separate disk backup when disk backup happening along with VM backup.

Answer 1

Just to add to @Leon Laude - Key points are also that it is agentless, does not affect VM performance while the backup takes place, and costs less then a full VM backup.

https://learn.microsoft.com/en-us/azure/backup/disk-backup-overview

Cheers,
Simon

Answer 2

Hi @santosh llc ,

By disk backup, do you refer to selective disk backup?

You can read from the official documentation a few example scenarios where this may be useful:
https://learn.microsoft.com/en-us/azure/backup/selective-disk-backup-restore

Scenarios
This solution is useful particularly in the following scenarios:

1. If you have critical data to be backed up in only one disk, or a subset of the disks and don’t want to back up the rest of the disks attached to a VM to minimize the backup storage costs.
2. If you have other backup solutions for part of your VM or data. For example, if you back up your databases or data using a different workload backup solution and you want to use Azure VM level backup for the rest of the data or disks to build an efficient and robust system using the best capabilities available.

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Best regards,
Leon