Backup with root and restore without root I have failed to backup and restore an app from my old to my new phone using this answer. The reason seem to be due to the app I want to backup is a "disallowed" type (ALLOW_BACKUP:NO) (I notice it later using Helium). First, it is strange that the answer linked did not mention that it only worsk for those app that are allowed to backup in their Manifest. Second, it seems that the only option is to do the backup with root, for instance by using Titanium. I don't mind to root my old phone to do the backup, but I would not like to root the new phone in which I want to restore the mentioned app. So is it posible to do the backup with root and then the restore without root, using for example titanium and Helium, respectively?
No, restoring the app-data from a backup of an app that has allowBackup=false will not work:

Helium uses AFAIR adb and if the app declares allowBackup=false you can neither create nor restore data of that app via adb backup.

Titanium does only work if the phone is rooted independently if you want to create or restore a backup.

The only chance to create a backup of an app with allowBackup=false is if the app provides an own backup/restore function within the app.