Save Notes to File - piotrpdev/notes-app GitHub Wiki
To save notes to a file, select option 10 in the menu.
If everything works successfully, you will be given a confirmation and shown the notes you have saved.
If something goes wrong, you will be given an appropriate error. This should not happen, if it does you are probably dealing with an operating system issue.
For more details on storing and retrieving notes, see the wiki section on "Persistence".