if you have already backed up nand then you'll be done it ten minutes.
1. start up modmii
2. type "i agree"
3. select "w" modmii wizard
4. select "n" no
5. select "3.x"
6. select "4.3"
7. select "a"
8. select "y"
9. select "y"
10. select "y"
11. select "y"
12. "y"
13. "y"
14. custom theme choice, u decide "y/n"
15. yes
16. "1" fat 32
17 "3" both
18. "usb"
19 finally yes to start download and custom tut.
you will then have two folders one called copy to usb and one called copy to sd card. (these folders will be wherever you have setup modmii to store them)
if you are not bothering with a usb loader then forget about the "copy to usb folder" for now.
format your sd card then copy the contents of "copy to sd" folder onto your sd card.
follow the intructions on the custom tut made by modmii and your wii should be fully hacked and up to date..
as for playing backup disks,
i dont really bother with that because the usb loader is easier and looks better, but im sure modmii puts a channel on for playing backups during the hack "looks like a blue spinning disk"