Hopping into this thread to assist you with backing up your company file, @Dmills1960.

Before anything else, do you happen to encounter an error message when backing your QuickBooks Desktop (QBDT) company? This way, I can provide the appropriate solution to get you back to business in no time.

In the meantime, we can utilize the Verify and Rebuild data utilities. That way, we can verify and correct your company file's most typical data errors. Please make sure your QuickBooks Desktop is up to date as well.

Here's how:

1. Go to Window, then Close All.
2. From the File menu, click Utilities.
3. Select Rebuild Data.
4. Follow the on-screen instructions to back up your data.
5. When the tool finishes, select OK.
6. Go to the File menu, then click Utilities.
7. Click Verify Data, then choose Rebuild Now once QuickBooks finds an issue with your company file.

I'm adding this article for reference: Verify and Rebuild Data in QuickBooks Desktop.

Once done, re-back up your accounting data to save this in case you run into problems. Then, restore this whenever you need it to.

If you acquire further assistance with QuickBooks, you can always drop by and post them here. Stay safe!