[Q] Doubt about nandroid backup

Hi out there! First should say im new on Android, and want to learn at least to a medium level user (flashing diferents ROMS, testing them, setting my phone how i like to, etc). Im now learning the basic vocabulary, looking and reserching about my android model and software. And the question is the next one:

I want to root my phone(SGS2/GT-I9100) by this method because i read the whole 44 pages of the thread and sounds safe, easy and all the people talks great about it (except one user that brick his phone ).



And i have read too that the first thing you should do after rooting is an nandroid backup, so you can get to this point in a future if something doesn´t work rigth.
Usually the nandroid backups are made with CWM or Titanium backup. I would like to use CWM, and my question is:

When I follow below rooting guide, the CWM isn´t permanent no? it just used to flash de SU-Busybox. So should i download and install it to make the "holy" nandroid backup?? I found this other thread where is explained how to make this nandroid backup, with RM and then using CWM.



So after rooting, i should follow those steps no?( i mean, getting RM) Because my doubt is that the first CWM (the one i use for rooting) is the same i can use for de nandroid backup?? or this one its just to flash the SU intaller and i need to download and install it (CWM)? So i can follow both guides without any problem? im not doing the same thing 2 times no?

Thanks, and sorry for my english, it´s a little rusty... Im a noob and hate my self (xD), but want to learn

Edited: Wrong tittle before, now is right

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