Hello, @angela4.
This error happens when something prevents the backup. Since this only happens to one of your company files, we can start by verifying the data of that company file to help detect the cause of the error, then run a rebuild to resolve it. Here's an article you can open that details the steps to run the verify and rebuild utilities.
Once completed, try doing the back up again. If the issue persists, I encourage reaching out to our Support Team to resolve the issue.
Here's how:
- Open this link: https://help.quickbooks.intuit.com/en_US/contact.
- Select QuickBooks Mac Desktop under Which QuickBooks do you need help with?.
- Click on the Search for something else button and type-in a short description of your concern under Tell us more about your question:.
- Hit Search.
- Choose a way to connect with a representative under Here's how to connect with a QuickBooks expert about " ...".
Post again if you have any other questions about backing up your QuickBooks company file. I'll get back to you as quickly as possible. Take care!
