. Downloading a ROM from the internet, even if you own the physical disc or cartridge, is generally considered illegal because you did not create the backup yourself.
WBFS ( Wii Backup File System) is a file system used to store and play Wii and Wii U games on various devices. WBFS exclusive refers to a specific format of ROMs that are optimized for playback on the Nintendo Switch using the WBFS file system. This format ensures that the game runs smoothly and efficiently on the Switch, with minimal lag or glitches. with minimal lag or glitches.