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I'm using a rooted Google Nexus 4 (mako) with CyanogenMod 11 and adb 1.0.32 on OS X.
I also use disk encryption.

adbd is running as root.
I'm trying to create a full backup using:

adb backup -apk -obb -shared -all -nosystem

However, regardless of the options passed to adb backup, it asks me to enter my backup password on the phone and then exists, showing Backup finished on the phone.
It only leaves a 549 bytes backup.ab file.

Using the wrong or no backup password does the same but leaves a 0 bytes file.

marked as duplicate by Community Nov 29 '15 at 16:55

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I found out the question has been answered at ADB backup creates 0-byte file; prompts for current backup password even though I never set one; "Failed to set password" for Desktop backup password

The solution is to revert to android-platform-tools 19.0.1 which bring adb 1.0.31, backups are working with that version.

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