I can help you with resolving the error you're having when trying to create a back up data, @deejay49.

First, make sure to update QuickBooks Desktop to the latest release to have the latest features and product improvements. Then, try to create a backup data. 

In case you're still having an error, try running the Rebuild and Verify Utility tool to fix possible data damage on your company file.

lease follow the steps below:

1. Open your company file again.
2. Go to the File menu, then select Utilities and choose Rebuild Data.
3. Click OK in the QuickBooks Information window.
4. Wait until the repair is done. Then, click OK.
5. Then, go back to the File menu and select Utilities and choose Verify Data.
6. Click OK if QuickBooks doesn't find any problems. Or Rebuild Now if it finds issues with your company file.

If you still get the same issue, let's try running the QuickBooks File Doctor to fix common issues. 

1. Open your QuickBooks Tool Hub.
2. Select Company File Issues.
3. Click Quick Fix my File.
4. Choose OK when it completes and launch your QuickBooks.

Here's more information about learning on how to verify and rebuild your data in QuickBooks Desktop.

Once resolved and in case you'd like to restore your backup and having trouble with it, refer to this article on how to resolve it: Fix backup company file issues in QuickBooks Desktop. 

Let me know if you need further help with creating your backup copy. I'm always here to assist. Have a great rest of the day!