3,781 votesVitaly supported this idea ·Vitaly commented
I'm sure someone already mentioned this (it hard to read all 1014 comments), but there is a solution for this problem. It is called Outline for Mac. It can store your OneNotebooks locally. You can use it instead of OneNote or simultaneously with OneNote.
I'm from the company who made it. App is paid. We created 33% discount for fellows who need local storage :-) use "localnotebooks" promo code when purchasing from Outline Store.