Android Backup

My latest experiences with android backup. The adb backup command does not necessarily backup everything.

• Backup on my device just hangs at “eu.darken.bluemusic” app – never finishes
• There’s no exclude option to only exclude some apps
• Even if backup finishes, the backup file does not contain any useful data, if the app does not have “allowbackup = yes” in its manifest. This is for example the case in Whatsapp