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This question already has an answer here:

how exactly can i create a update.zip file from an android device that runs on android kitkat? i tried to backup using titanium backup but it needs root access. is there any way to backup the complete rom without rooting?

marked as duplicate by eldarerathis Feb 4 '15 at 14:54

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adb has a built-in backup command. See, eg, this question for details.

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