Why are my backup jobs so slow?

Jim 41 Reputation points

Ive got around 10 different Resource groups. In each group there are around 10 VMs. Each group contains one Recovery service vault which contains these 10 VMs.
Now I have backupwindows in the night for around 2-3 hours. And I have to start all of them at the same time. Now some of them have up to 5 hours till they are backuped.

My VMs do not contain any data, so Im just backing up the hole VMs each night.
Can you tell me where the bottle neck is or what Im probably doing wrong?
I cant imagine that those jobs would take up to 5 hours for each VM.

For example I just started a backup for an VM which has around 800 MB to backup. And its now working since around 50 minutes....
Update: my manually activated backup took 55 minutes... the same automatic backup took 5 hours and 10 mins

Azure Backup
Azure Backup
An Azure backup service that provides built-in management at scale.
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  1. SadiqhAhmed-MSFT 25,381 Reputation points Microsoft Employee

    @Jim Snapshot data might not be immediately copied to the vault. At peak times, the backup might take some hours. Total backup time for a VM will be less than 24 hours for daily backup policies. See the image below. Reference link - Azure VM architecture


    For monitoring backups you can use Azure monitor or write a log analytics query as mentioned by Kamalakar here.


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