Can you confirm if the error you’re seeing is H303 while backing up in QuickBooks Desktop?
If so, this usually happens when one or more workstations are incorrectly configured to run in multi-user mode. Only the server computer (the one that stores your company file) should host multi-user access.
To resolve the issue:
On all workstations except the server, open QuickBooks without opening your company file. Then, go to File > Utilities and select Stop Hosting Multi-User Access if available. If you see Host Multi-User Access, do not select it; this workstation is not causing the issue.
On the server computer, open QuickBooks, go to File> Utilities, and make sure Host Multi-User Access is selected.
Save the backup to a local folder (such as Documents) and ensure your Windows user has Full Control permissions.
After completing these steps, you should be able to create backups without seeing H303.
If the error is not H303, please provide a screenshot of the exact error so we can give accurate guidance.
If you have any further questions or need assistance with QuickBooks Desktop, feel free to click the Replybutton.
Since you've rebuild the data and still encounter an error, you can download and install the QuickBooks Tool Hub to address the backup error. Once installed, use the Quick Fix my File or QuickBooks File Doctor utility to resolve the issue.
If the issue persists after running the tool hub, I recommend contacting our QuickBooks Desktop live expert for further assistance. The errors that the system detected during the data rebuild may require assistance from our QuickBooks Desktop live expert to fix. They have the necessary tools to help you back up your data and fix the errors.
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