Recover an old save?

I was making a map and I needed to changed engines because TF2 wasn’t loading fast enough. So I saved the map multiple times and when I pressed the close button it said “Would you like to save?” and of course I press yes. I open hammer again and choose Counter-Strike Source. I then open the map that I was just working on and found that it is a very old version of the map. Is there any way I can get to the map that I was just making? :bang:


Thank you so much! Now I only have to redo half of the map. :dance: