can answer for a MAC but for a windows PC there is a backup file created when you use desktop versions. it's not available directly when you open TT. it should be in the user's documents folder and in that folder the subfolder for Turbotax. it will start with a tilde ~ and end with .tax2021 if you didn't somehow delete that too. you can change the name and double-click on it with your mouse to open. are you sure you didn't use online last year? then there would be no desktop version of the data file
