a) Is the dump a complete 100% binary backup? (As a nand flasher)
yes
b) If firmware is screwed up, can we recover back with the dump backup? (As a nand flasher)
yes
c) I "suspect" that in the firmware of every wii, there's a OTP section which contains the private keys of the console which need to be authenticated before games can run (unless someone can remove/disable running of signed codes) Is Infectus able to backup/dump that area?
You are answering by your self...... if it's private, it's private.
and now i have some questions for you.....
a) Why no one answer to you?
b) Why don't read the specs on the site?
c) Why don't search in the forum?