Slimmmmmm said:
betwiin is the answer, you get to keep 100% of the save (no some of the save dan't be copied BS). Also miis can then be edited, also it's the quickest way to do all of this.
You get to keep ALL the crap too EG: message board stuff etc.
It's the closet way to clone a Wii we have with homebrew
Woooaaahh, hold on a sec, according to the betwiin docs, there are the following caveats (pasted below), some of which are pretty important in my opinion
like the fact that the serial is cloned, the shop accounts wont transfer or work, purchased channels wont work and will not be re-downloadable and probably most importantly, there is no bad block handling. Now I don't know about anyone else, but I have backed up the nand on quite a few wii's where then have been numerous bad blocks (factory or otherwise). If there's no bad block handling, surely the possability of restoring a nand backup to another wii with bad blocks in a different place is really risky!
I wonder how many people have used this tool and have no idea that some possibly important data is now sitting in a bad area of nand, this might not show up immediately, but you'll sure know donw the road if your Wii starts acting up.
I would use this with caution and certainly compare the number and positions of bad blocks (most wii's have them) on the source and destination wii's before using!
Caveats
* The version of boot1 you flash to a NAND chip must match the original one that shipped with that Wii. No exceptions.
* The version of boot2 must be equal to or greater than the one most recently installed on that Wii.
* No handling of bad blocks is performed; if your target NAND chip has a bad block that hits an important file required for system startup, I suggest you find a different donor dump to start from.
* Converting an image from one keyset to another does not guarantee everything will work. The serial number will be cloned, but that should not affect anything. The Wii Shop account will not transfer over, nor will the original account used on the broken Wii work. Most savegames should still work. Purchased channels will not work on the new Wii, nor will you be able to redownload them. You should be able to create a new Wii Shop account, all disc-based games should work, you can update the system online, etc.