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Unable to perform an adb backup with Jellybean?

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http://forum.xda-developers.com – Hello, I have the GSM Gnex running Jellybean build JRO03C. The device is not rooted and the bootloader is still in its factory state. I'm trying to do a backup with adb and it acts like it's working, but no backup file is generated. I'm using Linux with the latest android SDK platform-tools. When I run: sudo ./adb backup –apk –shared –all –f test_backup.ab I am prompted to unlock my screen and confirm the backup. I do not enter a password and initiate the backup on the handset. Then the backup app disappears and I see the home screen, with a small notification along the bo (HowTos)