It has to be one of the following LG drives. No other known drives will work.
LG-8164b
LG-8163b
LG-8162b
LG-8161b
(can also end in BK for black. B is beige)
You also have to use RAWDUMP to create the image.
And of course you still need a modchip or a softmodded Wii to be able to play the backups on. You cannot use backups on an unmodded Wii