Now every time you save, a backup with the XLK extension will be automatically created..
To restore this backup you have two options : you can substitute the extension of the backup file for XLSX and open the file as usual. Or, if not, you can go to the Excel tab? File? and select? Open ?. Click the button? Browse? and navigate to the folder where the file is.
In the file selection dialog at the bottom right, select? Backups ? instead of? All Excel files ?. Now you can see all the backups in this folder and open them directly to save them again in Excel format ..