So, I started using Terra on Standard, but I played as Ven and Aqua on Proud mode. So, before I start the Final Episode, I want to have a Proud mode Terra file, too. But, if I overwrite my current Terra file, will I lose stuff like Trinity Archives information, or the ability to fight the Wheelmaster in the Arena? Or will that stuff continue to be present regardless?

u wont lose any trinity archives info..thts permanent and for the wheelmaster all u would need to do is go back to the arena and get to tht match again pretty simple

You lose that file. Its like deleting a file off your computer. Its gone forever. I'm not sure if the Trinity Reports are still there.. If I were you, I'd just make a new file for Terra, and have one for standard and one for proud. That's what I did. So I have like 16 files lmao. Beginner, standard, proud, and critical for Ven, same for Aqua, same for Terra, which is 12. Then I have beginner, standard, proud, and critical for the last episode.