This may sound really stupid (and it probably is).
Some how, my WP install generates a daily backup which is stord in folder called something like: 11eb10be78-backups
The path to this folder is RootDomain > wp-content > 11eb10be78-backups
I have no clue which of my plugins is generating this.
I use two "suspicious" plugins:
Better wp security
Wp to dropbox (which makes a back up in my dropbox)
In Better WP Security I have switched off the backup option.
Where do they keep coming from?