Thanks for becoming part of the Community, oldspiker. I appreciate you sharing what you've tried so far.
 

Since you're still receiving an error message when attempting to back up your company file, I'd recommend getting in touch with our Customer Care team. They'll be able to pull up the account in a secure environment, conduct further research, and create an investigation ticket if necessary.
 

They can be reached while you're using QuickBooks.
 

Here's how:

1. In your top menu bar, go to Help, then QuickBooks Desktop Help.
2. Click Contact Us.
   
3. Enter a brief description of the issue in our Ask a question (or tell us what's wrong) field.
   
4. Hit Continue.
   
5. Select We’ll contact you for a callback or Message Us to start an instant messaging session.

Be sure to review their support hours so you'll know when agents are available.
 

Please feel welcome to send a reply if there's any additional questions. Have an awesome day!