Azure back up vs Snapshots
I'm an azure newbie and just trying to understand Azure better. My questions are about backing up Linux VMs to Azure. Please help me understand this better.
I read that Azure backup takes snapshots and then uploads them to storage. I'm trying to figure out how using "Azure backup" to back up a virtual machine is different from OS disk and Azure VM data disk snapshots via "az vm" cli commands?
What is storage here? Is it internally implemented as a blob container storage account or is it something like a glacier in AWS?
Which one is better low-cost, azure backup or osdisk snapshots?
If both options are similar, for example using an azure backup or with a snapshot of the OS / Data drives. Is there an advantage to using one over the other?
Are OS disk snapshots taken in Azure global in nature? Can you access them from any other geonets?
In azure portal, snapshots, what is "snapshot state"? Why is the snapshot state "Unattached" for me even after spinning the VM off the snapshot disk?
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I'm trying to figure out how using "Azure backup" to back up a virtual machine is different from OS disk and Azure VM data disk snapshots via "az vm" cli commands?
Azure Backup operates as a Disaster Recovery Service (DRaaS). It is a managed service and easier to use. You don't need to worry about where and how the backup files are stored. If the VM is running, the Azure Backup service uses the VMSnapshotLinux extension to take a point-in-time snapshot on Linux. Otherwise, the backup service takes a snapshot of the underlying storage.
What is storage here?
Backup Storage is a managed storage service that stores all backups created over time. It also contains a backup policy that applies to protected virtual machines.
Is it internally implemented as a blob container storage account or something similar to Glacier in AWS?
This is a managed service, it is not declared how it works.
Which one is better low-cost, azure backup or osdisk snapshots?
There is an additional charge for Azure backup than the costs. For more information, the link below is for reference.
Is there an advantage to using one over the other?
If you want to take a snapshot and the virtual machine is running, we suggest that you shut down the VM first to take a clean and consistent snapshot. Azure Backup will use the extension for this, we don't need to shutdown the VM.
Are OS disk snapshots taken in Azure global in nature? Can you access them from any other geonets?
Snapshots are just a read-only frame and can be accessed from any other geonet.
In azure portal, snapshots, what is "snapshot state"?
"Unattached" is the state of the image / disk. This means that the disk is not tied to any virtual machine.
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