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How do I fix Active Backup for Business error code 0x8004230F or 0x80042306?

Type cmd in the Windows search bar.
Right-click on Command Prompt and select Run as administrator.
Enter the command Vssadmin list providers to see what VSS providers are on your computer. If there are VSS providers other than Microsoft Software Shadow Copy Provider, they will appear in the Command Prompt window. Otherwise, "Microsoft Software Shadow Copy Provider" will appear by default.

If there are any VSS providers on your device other than Microsoft Software Shadow Copy Provider, make sure to remove them before proceeding with the backup.¹
If there are no VSS providers on your device other than Microsoft Software Shadow Copy Provider but the error still persists, then this error might be the result of compatibility issues. If the following software is installed, uninstall it or contact your service provider for assistance before proceeding with the backup:
- Reboot Restore Rx
- TuneUp Utilities 2009/2010/2011
- Kaspersky Removal Tools

Do the following to check if the error resulted from compatibility issues:

Press Windows key + R on your keyboard.
Enter systempropertiesprotection and click OK to open System Properties > System Protection.²
- If there are compatibility issues, System Properties > System Protection will not be able to open properly, and the following error message will appear:

- If there are no compatibility issues, you will see the following window:. Click Create to check if VSS is functioning properly.

Notes:

If Synology VSS HW Provider appears on the list of VSS providers, uninstall Synology Storage Console for Windows on your computer before proceeding with the backup.
The System Protection tab is unavailable on Windows servers. As an alternative, install Windows Server Backup and perform a system backup. If you encounter any issues with Windows Server Backup, contact Microsoft Support for assistance.