I had a couple projects I was working on and just accidentally saved one over the other. Is there anything I can do to recover the file that was overwritten? I'm running pico 0.1.11f in mac os 10.7.5

Yes! (Maybe!)

Type FOLDER in PICO-8 so that you bring up your "carts" folder.

Go up one directory from there, so that you're in the "pico-8" folder, and in there you should see a "backup" folder. My understanding is... if you haven't repeatedly saved that file over and over, the old version of it should still be in here.

aaaaa i recovered it! thank you thank you!!