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Running adb backup -apk -shared -all on an Android device yields Now unlock your device and confirm the backup operation. on the Terminal and a prompt on the device screen that requires user intervention. I was hoping to automate backup and restore from adb. is there a way to force and proceed with backup without user confirmation?

Mike Laren
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radj
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2 Answers2

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My solution for this case is to use dd (it's available in vanilla Android, and custom recoveries, like TWRP, as well):

sudo adb shell dd if=/dev/block/bootdevice/by-name/boot > boot.bin
sudo adb shell dd if=/dev/block/bootdevice/by-name/modem > modem.bin
sudo adb shell dd if=/dev/block/bootdevice/by-name/system > system.bin

...Or with compression:

sudo adb shell dd if=/dev/block/bootdevice/by-name/system | xz -9 -T0 - > system.bin.xz

Later the binary image can be transformed to any desired backup format.

dess
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This can be done using fastboot command by pulling data off the inactive Android device. Here's a sample tutorial on this at XDA University.

radj
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    In the link you posted, I cannot find instructions to do a backup using fastboot. It only instructs, how to create update.zip-files (including scripts) to modify something on the device as far as I can see. Could you please post the steps needed here? Thanks – Jannis Feb 16 '16 at 08:26