Bootmii as boot2 is great but the backup takes a while. I have my system set the way I want with the games I want but I also like to play with things that could software brick the wii. I have noticed for me the only thing that will change on a regular basis is the saved game files.

This would be mainly for Wii programmers
This would use an rSync like backup/restore of the saved games to a network computer, SD, or USB hard drive.
If you dont know rSync will check the files for the part of the file that has changed and just send that part. The Wii may not be powerful enough to quickly check parts of the files but it may be good enough to hash the entire file (psudo-rsync)

If this post does not make sense, sounds pointless, or you have a better idea please let me know.