Full Backup of Nexus 6 Android Smartphone

1. Turn on backup in "Settings"
2. Do full system backup using adb command over USB:
   1. Install the android-tools package
   2. Turn on USB debugging in Settings->Developer options
      Go to "Settings -> About phone" and tap "Build number" seven times to turn on "Developer options" if you don't have it
   3. Plug in
   4. Authorize USB debugging on phone if prompted
   5. Do "adb devices" to confirm that device is connected and listed
   6. Do "adb backup -apk -shared -all -f backup.ab"
   7. Follow instructions on phone to unlock/set encryption key

"adb restore backup.ab" will do the restore

Don't bother compressing the file

Backups are on fileserver - MyLibrary/Android_Phone_Backups