adb shell bmgr enabled
adb shell bmgr list transports
adb shell bmgr backupnow com.googlecodelabs.example.backupexample
adb shell dumpsys backup
adb shell dumpsys backup | grep "com.googlecodelabs.example.backupexample" -A 4 | grep Current
adb shell bmgr restore $token com.googlecodelabs.example.backupexample