Azure Backup Failing - Internal error code: 0x80990A59

Eoin 0

Hi all,

Azure backup is failing with this error message - Microsoft Azure Backup failed to access the shadow copy because of inadequate disk space on the volume. Internal error code: 0x80990A59.

After investigating ourselves we found articles suggesting to add more space which we have done - current folder size is 1.6TB with 700GB of free space on the VM.

Would anyone have anything else we can look at?

SadiqhAhmed-MSFT 45,276 Reputation points Microsoft Employee

2024-07-29T17:12:46.9966667+00:00
@Eoin Thank you for contacting us. The error message "Microsoft Azure Backup failed to access the shadow copy because of inadequate disk space on the volume. Internal error code: 0x80990A59" indicates that there is not enough disk space available on the volume where the backup is being stored.

Since you have already added more space to the volume and there is still 700GB of free space available, it is possible that the issue is related to the shadow copy storage space.

You can try the following steps to resolve the issue:

Check the shadow copy storage space allocation. You can do this by running the following command in an elevated command prompt: vssadmin list shadowstorage

If the shadow copy storage space is full, you can increase the maximum size of the shadow copy storage space by running the following command in an elevated command prompt: vssadmin resize shadowstorage /for=<volume> /on=<volume> /maxsize=<size> Example to resize: vssadmin resize shadowstorage /for=C: /on=C: /maxsize=20GB

Check and Increase Shadow Copy Storage Size

Increase Shadow Copy Storage: If the allocated size for shadow copies is too small, increase it as shown above. The shadow copy storage size should be large enough to accommodate the volume's changes and snapshots.

Check for Errors in Event Logs

Event Viewer: Look at the Windows Event Viewer under "Windows Logs" -> "Application" and "System" for any VSS-related errors. These logs might provide more detailed insights into what’s going wrong.

Clean Up Old Shadow Copies

Delete Old Shadow Copies: Use the vssadmin tool to delete old shadow copies if they are taking up space.

vssadmin delete shadows /all Be cautious with this command as it will remove all shadow copies, which may affect restore points.

Check Backup Configuration

Backup Schedule and Settings: Ensure that the backup schedule and settings in Azure Backup are correctly configured. Sometimes, misconfigurations or conflicts can lead to issues with shadow copy creation.

Restart Services

Restart Services: Restart the Volume Shadow Copy service and the Azure Backup service to clear any temporary issues.

# Restart VSS service Restart-Service vss # Restart Azure Backup service (replace with actual service name if different) Restart-Service AzureBackup

Update Windows and Drivers

Update OS and Drivers: Ensure that your operating system and drivers are up to date. Sometimes, updates include fixes for issues related to VSS and backup services.

Review Azure Backup Logs

Azure Backup Logs: Check the Azure Backup logs for more detailed error messages or information. Logs are available in the Azure portal under the Backup item for the specific resource.

Perform a Test Backup

Run a Test Backup: After making adjustments, perform a test backup to see if the issue persists.

Contact Microsoft Support

Get Support: If none of the above solutions resolve the issue, please contact Microsoft Azure Technical Support. Provide them with detailed information, including error codes, configuration settings, and log files.

Hope this helps. Let us know how it goes!

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