I am struggling to get the new Nucleus One working the way I want. I installed an 4TB internal disk. I want to copy my backup and music folders to the internal disk. Seems the Nucleus want to scan the whole disk. I can’t make it only scan the music folder. Also I can’t get it to use the internal disk as backup location. Now I have formatted the internal disk (in Roon) for the third time. I would really like to have the backup folder and the Music folder on the new internal disk without needing to have the external USB disk where I have the old backups and music folders connected. Any idea how to do this?
You cannot place the backup on an internal drive attached to the Nucleus.
As the help article on the Nucleus Internal Storage says:
The entire internal storage drive will be used for music content. If you need subfolders of this disk to not be in Roon, you must connect the drive via USB and choose the folders that you want to use in Roon.
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It’s meant to be used as a dedicated music server, not a general purpose computer
Besides what good is the BU internal to the device if the device fails ?
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The whole point was to get rid of USB devices. The extra disk should be fine even if the device and its internal memory fail. Also, I would fetch the backups from its network shares to other storage devices. This is how I have now made a temporary solution. Both the backup and the Music folder are connected internally using the \nucleusone\data share. Shouldn’t be necessary when an extra disk has been added.
It is only used as a music server. Including the Roon database backups
You can simply back up by SMB to these other storage devices in the first place, no need to first do it to an internal or external disk.
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Here is how it ended up. The extra SSD disk placed internally is monitored for new music. I added an exclusion for scan folders \Backup\ in addition to the existing \tmp, \temp exclusions. Hopefully there will be no album called Backup 
The Roon database backups is done to the share \nucleusone\InternalStorage\Backup\ folders. Also, I will regularly start a PC to fetch the \nucleusone\InternalStorage\Backup\ files to an external disk that also holds backup of my music
This is a very bad idea, and you should not do it. The InternalStorage folder is a Watched Folder and Roon Labs specifically say:
We strongly recommend that you do not set the location of Database Backups to be within any Watched Folders because Roon will try to scan that directory and scan the Database Backup itself. This can cause issues, so please keep the locations separate.
I know that you’ve set up an exclusion, but still…
They for sure exist, even maybe none of them are in your library currently. Just two that a quick search revealed;