I just resolved a similar situation, although I still have no idea how it happened. I went to open a 2020 return to look for some information, and both the tax file and the corresponding pdf were gone, and not in the recycle bin. (I use the desktop version of TurboTax.). They’d been there the last time I looked a few weeks ago.
Luckily, I run backup software which lets you look at your drive as it existed on a given prior date, and I restored the files from there. But you can bet I’ll store duplicate version from now on!
