1.no the nandroid backup does not backup your sd card. only way to do it is to back it up to a computer. or some cloud service like dropbox. and i'm not exactly sure what you mean by getting sd card data? anything saved to the card will still be there, unless you wipe the sd card, then they will not be.
2.never played nova, but i believe that i does have its own folder on the card and that is probably where everything goes.
3.again amend and edify are scripts that tells the recovery how to flash or install a particular file or to perform certain functions. for example, there is a file called superwipe that wipes the system partitions, cache, and dalvik cache 3 times and the it wipes any temp files and does this 3 times. it is just that a superwipe file. however, it is in amend scripting and you cannot flash this with cwm.
4.no a custom recovery is separate from the rom so switching will not have any affect on your rom now. i know this cuz i know this. lol and you will get a phone that might not work correctly. you might get a lot of fc's or the phone may not boot up at all. it will not brick the phone, but cwm not wiping will just create more headaches then it is worth it. but hey, this is all up to you. i'm just giving you some advice from my experiences over the years with my rooted og evo. what you do with it is all you.
5.what is cf-root? wait.....what phone do you have?
Im using samsung galaxy s3-GT-i9300
2. and if the download data of the game on internal sd card with get erased when perform wipe all user data on cwm, right?
so i need to manual copy that to my phone, before wipe user data right?
3. so basically if cwm just use edify, so some file like superwipe can't be flashed, then it will causing problem to phones or that file get deleted?
wait, is that files or apps?
4. so what should i do? if i want to use amon ra, i must remove cwm right?
or what? i'm on my wits end now..
5. like i say, i use samsung galaxy s3, cf-root = 1 click root, lol
SORRY, I didn't notice that got into EVO 4G thread, but if there any help i'll appreciate it. thx's..
SORRY, please forgive me, as im in frustating mode yesterday and not notice that.