Hello @Carol102,
Thank you for sharing the troubleshooting steps you tried to get rid of the error message while creating a backup copy in QuickBooks Desktop for Mac. Since the issue persists, I'd recommend contacting our Customer Care Support.
With their tools, one of our specialists can pull up your account on file and create a case number to let our engineering team look further what the root cause of this problem. To connect with our team, you can do so by following the steps shared by my colleague above.
Additionally, I've also included this reference helpful with a compilation of articles you can use while working with us: Browse all Articles for your QuickBooks Product.
If you have any follow clarifications with this or other concerns with QuickBooks navigation and task entry, please let me know in the comments below. I'll be here to lend a hand.
