OneNote Help (Autobackups not Working)

Any help please, for some reason there isn't a File button to manually backup & the auto backup isn't backing up certain notebooks.

OneNote for Windows 10 | Version 16001.14326.22594.0

(r/Onenote wont let me post because I have low karma despite having a several year old account & r/Microsoft wont let you post asking for assistance god I hate reddit.)