Hello @WilliamBloomer-8274,
Thank you for posting your query on Microsoft Q&A.
Based on your description, I understand that you are looking to unjoin the device from Entra ID so that you can enable automatic backup for QuickBooks.
To unjoin pure Microsoft Entra joined devices, make sure you have an offline local administrator account or create one. You can't sign in with any Microsoft Entra user credentials. Next, go to Settings > Accounts > Access Work or School. Select your account and select Disconnect. Follow the prompts and provide the local administrator credentials when prompted. Reboot the device to finish the unjoin process.
How do I unjoin a Microsoft Entra joined device locally on the device?
For more details, including screenshots, you can refer to the blog post below:
How to Unjoin a Windows 10/11 Device from Entra ID
Unjoining the device will not delete any files from your device. All files stored in the Downloads, Documents, Desktop, or Pictures folders will remain available under Local Disk (C:) > Users > [Your Username] (e.g., C:\Users\Myname).
I hope this information is helpful. Please feel free to reach out if you have any further questions.
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Thanks,
Raja Pothuraju.