Backup in recovery

What is the difference between nand backup & bart backup.
Thks.

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Well I'm not sure what a "bart" backup is, but a nandroid backup is like a snapshot of your current setup that you can go back to anytime. If you turn off your phone and back it up you can reflash it at anytime and when you turn the phone back on it will be like you had changed nothing since you made the backup.

 

There was two choices. Nand and nand -ext. Not sure what the difference is. Thanks