Adb backup does not work

Question

I need help from you guys, because I don\'t know what I did wrong with adb backup.

I want to backup my Samsung Galaxy S3 LTE (GT-I9305) without root. I googled it and fou

Answer 1

adb backup -all worked partway for me, then froze. using all the options NG gave prompted me to unlock and confirm, but then immediately exited without giving me the chance. using -system alone gave a useless 46-byte "backup".