Sometimes there are these little things that you somehow do not notice ...until one day you do.
The thing I stumbled on, is that the NotesItem has a property called "SaveToDisk".
You can set whether a NotesItem should be saved to disk or not when a document is saved,
This is a companion discussion topic for the original entry at https://nevermind.dk/nevermind/blog.nsf/subject/the-very-useful-little-feature-of-a-notesitem