Sesame backup issue in Android 10 solved
The issue was described in now closed thread:
https://zentalk.asus.com/en/discussion/13918/sesame-backup-issue-in-android-10
The latest Sesame version finally solved this issue after 14 months:
https://www.reddit.com/r/sesame/comments/l29747/sesame_364beta12build_15055_finally_solved_backup/
Turned out to be connected to the storage changes (in A10).
This discussion has been closed.