I want to beat Miitopia again (Cuz of it's wonderful soundtrack) but i don't want to wipe all my save data out from my 3DS cartridge, so i should buy Miitopia HD for the Switch? I don't know because i don't like how saturated, plasticky and shiny the HD remaster looks
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Export the save using a save file manager, then delete the save from ur 3ds (MAKE SURE IT'S IN A SAFE PLACE) and play!
use checkpoint on your 3ds or if you don't somehow download it from a website then put back your 3/2ds go to fbi then sd then cias then download yooy :D now use it to backup your data. if your bored but still want to continue it back that up and restore the one you want to play.