A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
I had the same issue a time ago, and due that, I started to work with small notebooks synced with my mobile devices.
Sorry for this but, the cache copy is in a completely different format than the original files. All notes are fragmented into small portions. Each “fragment” represents an object, such as a paragraph of text or an image.
These cache files are not usable, for example as a notebook backup. They are also rather fragile.
So, you will need to copy your notes to other location in order to avoid a dataloss.
Is clearly that OneNote for mobile version need a backup feature for this situations.
I suggest you to send your feedback to iOS OneNote UserVoice.
Is the only way to communicate with Product group, they always see ideas and suggestions from community users.
https://onenote.uservoice.com/forums/327180-one...