Before I did the storage update, I saved all data from the data-partition to my computer.
I thought that the app Backup&Restore saved my app settings, but it doesn’t seems so.
No I tried to restore my app settings from the domain-name-Folders in Android/data/ for example com.fsck.k9 but this also doesn’t work.
Anyone a hint to import K9 Mail-Seetings? Unfortunatly I didn’t used the internal export function