You won't find a save button in any OneNote version because it automatically caches, saves, and syncs your files on a pre-defined schedule. By default, OneNote saves your notebooks to OneDrive or, if you choose to create a local notebook (not an option available on OneNote for Mac), your Windows Documents folder.

Where are my OneNote files saved?

OneNote automatically stores backups of your notes on the same hard disk drive as your original notebook files. ... On Windows 10, the Backup folder for your notebooks is located at C:\Users\user name\AppData\Local\Microsoft\OneNote\version\Backup.

Does Microsoft OneNote save automatically?

OneNote automatically and continually remembers and saves everything you do — including typing, editing, formatting, organizing, searching, and sharing your notes. You can even safely exit OneNote at any time without first closing your notebooks or manually saving any of your work.