Similar but different question..

Started work on a song, saved the .sgu on windows 10 laptop running BIAB '21, came back next night (hadn't updated to the latest version)...got about 30 bars in, saved came back next night, noticed the date/time was wrong on the laptop, changed them to the correct ones..worked on the song up to about 60 bars, saved, exited..came back next day, tried to find song but only the .sgu name was there, no other info...is there an 'undo' level I can go back to? Any idea where the correct .sgu went? Thanks.