Here's a link that might be helpful
https://ttlc.intuit.com/community/tax-data-file/help/how-do-i-back-up-my-tax-file-in-the-turbotax-cd...
I believe that the Mac program automatically saves the .tax file or should. And people have asked how to not save it on Mac in case they messed up.
In the Windows Desktop program you have to manually save the .tax file and it should ask if you want to save when you exit or start a new return.
