Hello there, @Bella24. Thank you for posting here in the Community.
I appreciate the information that you provided and for sharing screenshots with us. I'm here to ensure that you'll get past this error so you can back up your data successfully.
When doing the Verify process, the system can locate the issue, and you'll be prompted to Rebuild Now or View Errors. You can close the prompted message and correct the errors manually. You can follow the steps in this article to do this: Resolve Data Damage on your Company File. So, don't be afraid it can help resolve damaged list elements, and it will not lose your stuff.
If the Verify/Rebuild process is not working, you can update the QuickBooks to the latest release before proceeding to the next troubleshooting steps.
For more details about this process, you can check out this article: Learn how to verify and rebuild your data in QuickBooks Desktop for Mac.
I'm always around here in the Community if you need additional help in accessing your company file. Feel free to leave a comment below. Take care.
