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Phone: Moto C Plus

Phone OS: Android 7.0

PC OS: Windows 7

TWRP: 3.1.1

Rooted

I'm trying to backup directly to PC from TWRP recovery through adb cmd.

The cmd adb devices shows the device id and the word "recovery" next to it, meaning i'm connected successfully and that i'm in recovery. USB debugging is on.

But adb backup --twrp shows...

WARNING: adb backup is deprecated and may be removed in a future release

Now Unlock your device and confirm backup operation

followed by the current directory.

But nothing happens on the phone. This is what's supposed to happen. Skip to 3:26.

Any insight?

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  • Ifyou have no space left the only option would be to create the backup on-device and stream the backup file data directly to the PC using adb exec-out .... See for example this answer which performs a low-level backup. Not sure if twrp backup support this on a higher level.
    – Robert
    Aug 7 '20 at 8:55
  • @Robert Can you help me breakdown this cmd 'adb exec-out dd if=/dev/block/(bootdevice/)mmcblk0 > emmc-backup.img' What changes would i have to make to suite my particular need?
    – JJrussel
    Aug 7 '20 at 9:37
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    'adb pull /dev/block/dm-0 data.img' or if not encrypted 'adb pull /dev/block/platform/mtk-msdc.0/11230000.msdc0/by-name/userdata data.img'
    – alecxs
    Aug 7 '20 at 9:49
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There is nothing wrong with your backup. You are just impatient. Please ignore WARNING adb backup is deprecated... Now Unlock your device and confirm... that is just because the adb.exe doesn't know what's going on at phone side.

You should see TWRP backup starting at phone display immediately without any confirmation

watch the backup.ab growing until backup process is complete

i recommend to backup each partition for it's own, that way you avoid trouble with some old bug TWRP just restoring first partition

adb backup "-f twrp_data.ab --twrp --compress data"

you can convert that backup.ab later into data.ext4.win with twab.sh (linux only)

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  • Comments are not for extended discussion; this conversation has been moved to chat.
    – Firelord
    Aug 8 '20 at 11:49
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    fyi: reason for adb backup --twrp not working is adbd isn't running with root privileges in this TWRP built (claim it to TWRP maintainer)
    – alecxs
    Aug 11 '20 at 15:14

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