How to Stop Excel from Creating Backup Copies of Your Files

1. Open Excel and click on the Office Button in the top left corner.
2. Click on "Excel Options" at the bottom of the menu.
3. In the left-hand menu, click on "Advanced".
4. Scroll down to the "General" section and look for the "Create backup files" option.
5. Make sure this option is unchecked.
6. Click "OK" to save your changes.

If you want to keep the option enabled but change the location where the backup files are saved, you can do that too. Just go back to the "Save" section of the Excel Options and look for the "AutoRecover file location" option. You can specify a different folder where you want the backup files to be saved.

If you're still having issues, you may want to try repairing your Excel installation or resetting your Excel settings. If all else fails, you can try reinstalling Excel.

I hope that helps!