[Q] Different backups, superusers, and flashing kernels
I have learned a lot about Android customization in the last week since my Nexus 4 finally arrived at my door, and I have become reasonably comfortable with the processes of flashing ROMs/kernels, and backing up my phone to make sure I have something stable to return to if something happens to go wrong. However, I am still dealing with a few points of confusion that I was hoping someone could clarify for me:
1. I have CWM installed on my phone and I can use it to backup/restore images of my phone for safety. However, I have heard about other methods like Nandroid, Carbon/Helium, and Titanium Backup while browsing the forums, and have tried them only to become confused as to how they are different from using CWM backup. Could someone please explain this to me and clarify which is the best for keeping a backup of my phone stored on my computer?
2. I have noticed that when I "wipe date/factory reset" in CWM, not everything on my phone is wiped. There are still plenty of files left over from previous ROM installs when I browse my phone with Android File Transfer, and obviously the .zip files you need to flash new ROM's/kernels are left too. What exactly is deleted when do a CWM factory reset?
3. Is it necessary to wipe everything when installing a custom kernel? I have CyanogenMod 10.2 installed because it is quick and relatively bloat-free, but allows for enough customization that I can make the my phone feel the way I want it to. I want to give Matr1x/Hells-core a try, but I am tired of factory reseting everything when install a new kernel. Can I get away with just wiping Cache/Dalvik and flashing the new kernels? If not, what is the best way to avoid losing app data between ROM and kernel flashes?
4. What is the difference between the default Android superuser, CWM superuser, and SuperSU? They all seem like the same thing and it makes me nervous installing different ones.
Any information you guys can offer would be great. Thank you so much for your time