Before attempting any story route that locks you into long cutscenes (e.g., the "Arc-V" final chapter), make a manual save in Slot 2. This prevents you from losing your main progress.
A 100% save file provides:
The fan translation patch does not corrupt save data . You can load a Japanese save file into the English-patched version of the game perfectly fine. yu-gi-oh arc v tag force special save data
the folder, which will typically be named NPJH50832 (the game's Japanese ID). Before attempting any story route that locks you