Microsoft Excel has its default data recovery process if the Excel application crashes. Other than that, there is no special backup system in this file. This is a simple regular Excel workbook. So, please save regularly (keyboard shortcut Ctrl+S) as you are working with it, so that your changes are not lost.
Also, have a regular back-up process. For example, you can save a copy of the file every week and name it with the week number or weekend date.
You will continue to use the Main file as the default working file, but if you delete that file by mistake, you can be assured that you have your weekly copy saved. You could keep only the last few weeks’ files and keep deleting the older copies as needed.