I found a really cool glitch that allows you to save outside of the final boss fight, but the auto save feature erased my older save files. I'm stuck outside of the light barrier in the final boss fight and even if I beat dark beast Ganon it reloads me to when I'm outside the light barrier. Is there anyway to retrieve overwritten save files in Breath of the Wild?
I am not too familiar with zelda, but if the game says it "overwrites" or "deletes" the save files, then your previous saves do not exist, since the game deletes your old saves and replaces them with the new data. The only thing I can think of to help is to find a mod/hack to give you a save before the boss. Other than that, your progress was for nothing and you will have to start over.