Is it possible to put wii or roms game on the sd card and work in regular wii?
First of all you need a modchip to play backups or homebrew.
1) To play wii-backups you need a DVD burner.
2) To play gamecube homebrew you can use a SD card in a SD gecko and the SD loader on DVD. You can not use the internal SD reader for anything homebrew related, except you do a hardware hack and make it a gecko!