The System Menu alone does not enable backups. You need cIOS (custom IOS) and a USB loader. The menu is just the visual shell.
Downloading a is a common task for users looking to update, restore, or downgrade their Wii console's operating system . However, downloading pre-compiled WAD files from random websites is highly discouraged as it can lead to "bricks" (permanent system failure) if the file is improperly packed or malicious. wii system menu 4.3 wad download
18;write_to_target_document1b;_PnXuaevfMP2aptQPhe232Q4_100;6; The System Menu alone does not enable backups