Good day @Saturn94 !
I hope you’re doing well today.
We were able to reproduce your problem internally.
The likely issue that’s the cause of the problem is that when writing a backup to the root of the disk - file “roonbackup_root_” is not created which is also a part of backup .
That’s why you can’t see the backup made to a root of the disk.
The “Backup now” option eliminates this problem by simply restricting and not letting you to write a backup to the Root of the disk.
We have open an internal ticket for investigation and will keep you posted on a progress.
Have a nice day!
Regards.