FOR OTHER NEWBIIS OUT THERE..........
Discovered via google that you just rename bootmii, for example to bootyou and the system doesn't boot it.
then if you have problems just put the sd card into pc and rename as bootmii so that the wii recognises and boots prior to wii system.
important to backup wii nand via bootmii as soon as possible so that you have a safe backup.
I haven't read yet on how the backup is saved to sd and if it overwrites any other info on card or finds empty slot? or if it requires anything else on the sd card to reinstall. If not I plan to save it to a seperate sd to keep safe incase of emergency