Azure VM Backup taking longer than expected

Question

Azure VM Backup Taking Longer than expected. This is not an initial backup

Answer 1

If your Azure VM backup is taking longer than expected and it is not the initial backup, there are several factors that could be contributing to the delay:

1. Performance Bottlenecks: The computer you are backing up may be experiencing performance issues that can slow down the backup process.
2. Interference from Other Processes: Other processes or antivirus software running on the system may interfere with the Azure Backup process, potentially causing contention and delays. It is advisable to check if other backup services are running simultaneously and to consider disabling them.
3. Backup Agent on a VM: Running the Backup agent on an Azure virtual machine can inherently lead to slower performance compared to running it on a physical machine due to IOPS limitations.
4. Large Number of Files: Attempting to back up a very large number of files (millions) can also lead to longer backup times.

To improve backup performance, consider following best practices for Azure Backup, such as ensuring that the latest Azure Backup agent is installed and reviewing the Azure Backup service FAQ for common configuration issues that may affect backup efficiency.

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References:

• Troubleshoot slow backup of files and folders in Azure Backup
• Frequently asked questions-Back up Azure VMs

Answer 2

Hi Mitcheal J
Backup duration can vary depending on several factors, and a longer runtime does not always indicate an issue.

• If this is the initial backup, it typically takes more time because Azure must create a full backup of all data. Subsequent backups are incremental and usually complete faster.
• The size of the data and rate of change also impact duration. Larger disks or frequent data changes can extend backup time.
• Backup performance may be affected during peak usage hours due to platform-level throttling designed to maintain overall service stability.
• The VM’s performance and disk type play a role. High CPU or disk utilization, or use of Standard disks with lower IOPS, can slow the backup process.
• Temporary network or backend service load in the Azure region can also cause delays.

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