Thank you for
reaching out on the community and telling us about your issue. I do apologize for the issue you're having. That's an odd message since you're using the 2020 version. Did you previously have the 17 version as well? I'm wondering if we may have opened the 17 version since the icons look very similar. If you wouldn't mind could you take a screenshot of your screen along with the error when you back up. It'll help us figure out exactly what's going on.
Once you get a chance to upload a photo let us know and we'll take a look.
Q user since February, 1990. DOS Version 4
Now running Quicken Windows Subscription, Business & Personal
Retired "Certified Information Systems Auditor" & Bank Audit VP