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lol you post right before me lolA nandroid backup is a complete snapshot of your phone exactly the way it is now. Your internal storage is partitioned into sections (they're just called partitions, appropriately). Those partitions include the system itself, system data and settings, user apps and data, etc. It's everything that is currently one the phone. You can make as many changes after making a nandroid backup as you want. You can install apps, change settings, wipe the phone, even flash a new ROM. If you restore a nandroid backup, everything you've done since that backup is wiped out, and you will go back to exactly what you had when you made the backup. As such, it can be used to:
a) Save yourself in the event that you break something, and need to go back to a working configuration, and
b) Save configurations that you like. If you flash different custom ROMs, then set them up how you like, you can nandroid backup each one, and switch between whenever you like.
Note that a nandroid backup is not the same thing as, say, a backup made with titanium backup. Those kinds of backups are meant for transferring apps and data between ROMs, or for saving data when you wipe everything on the phone.
a Nandroid backup is an ENTIRE backup of your phone depending on which recovery you have... Which what is your recovery version?? If you have 2.6.0.1 or up of clockwork recovery then it will make an entire backup. Im not sure about RA recovery cause i have never used them. They can be used to restore your phone if you run into problems like permanently losing your 4G you can do a nandroid back up to restore them so you arnt without 4G forever. Also it helps if you have a rom just how you want it you can make a nandroid backup to always revert back to. In other words they are life savers.
boot into recovery by holding down power and the down volume your phone will boot into the boot loader scroll down and select recovery. then go to backup and restore and click restore and select the backup you want to restore once its done restoring simple reboot your phone!
once in recovery you should wipe data, cache and dalvik cache before restoring a backup.
^^ personally I wouldn't try with out. it only takes a few seconds and can save you tons of time IF you do run into issues.
but to each his own
So if I wanted to put Mikfroyo on my evo I should make a nandroid backup?
So if I used the Rooting guide for dummies and created a nandroid backup manually...If I restore to that backup will I lose my root?
hrmm... I think i'm getting it now. A nandroid backs up the ROM portion of the phone, which includes /data and the dalvik cache, right?
What about the kernel? Is it part of a ROM?
A bit of OOT question: how do one undo the flashing of a radio? Do I flash a previous version over the one I want to undo? Are there tools for me to back up my current radio in the event I cannot locate my current radio image in the wild?
I assume the same question would apply to the HBOOT?