"Back up all" fails - "Unsuccessful"

Hi ASAMM,

recently, my Locus Map fails to create full backups via "Back up all". After the typical while, ca. 20 seconds, the orange Locus hint "Unsuccessful" appears. Backup "settings only" works.

As per standard, my backups go to /storage/emulated/0/Android/data/menion.android.locus/files/Locus/backup/

The expected size of full backups is about 400 MB. Free space is 20 Gig.

It's LM 4.13.1 on Android 10.

I have currently no idea how to track this down.

Thank you.