Hello, KH4802. 

I've got additional steps to keep you going. 

There may be some minor data issues with your company file that's why you're having backup error. Try running the Rebuild and Verify Utility tool to fix possible data damage on your company file. 

Please 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. 

I'm adding this article for more troubleshooting steps: Fix data damage on your QuickBooks Desktop company file.

Once done, try creating a backup of your company file. Back up your QuickBooks Desktop company file. 

However, If the verify and rebuild won't fix the issue, you can run the QuickBooks File Doctor. Doing so helps resolve common company file issues and errors.

First, let's download the QuickBooks Tool Hub. For the best experience, I recommend using it on Windows 10, 64-bit. Once ready, here's how to get started:

1. Close QuickBooks Desktop, and then download the most recent version (1.4.0.0) of the QuickBooks Tool Hub. 
2. Save the file somewhere you can easily find it (like your Downloads folder or your Windows desktop). 
3. Open the file you downloaded (QuickBooksToolHub.exe), and then follow the on-screen instructions to install and agree to the terms and conditions.
4. Once done, double-click the icon on your Windows desktop to open the tool hub. 

Next, run the Quick Fix My File. Here's how:

1. From the tool hub, choose the Company File Issues tab.
2. Select Quick Fix my File, and then click OK once completed and then launch your QuickBooks.

Then, follow Step 3 to 4 outlined in this article to continue the troubleshooting steps: Fix company file issues.

If the same thing happens, I suggest getting in touch with our support. They can check your account securely and perform more steps to help fix this. See this link for the detailed instructions: Contact Support.

To make sure your issue gets taken care of right away, please check out our support hours: QBDT support hours. 

Stay in touch with me if there’s anything else you need. I’m here to help however I can. Enjoy the rest of your weekend. Stay safe!