Currently I am working to fix the backup/restore problems on Android 9.
A internal Android change has made problems with backup/restore because they use now a cache for the database. So you see after restore no data or a very old data.
I am currently trying to fix the issue.
UPDATE 9. February:
In the current 3.5.7 BETA 1 this problem is fixed.
So you can wait for the stable 3.5.7 release or join the beta to get the fix.
