Like many busy people I live in a world of work and a world of family. OneNote is everywhere. There are aspects of it that are genius (and I'm hoping to write about this to explore that).
But the prospect of losing all or part of a page or a notebook - especially if one doesn't notice it - is terrifying. And reading around the web and from experience, it's too easy to do. And MS guidance on this is typically too blase on one hand or technical on the other. I would describe OneNote as both high value and at the same time surprisingly risky.
The single best comment on this was made by an earlier poster who said as follows:
"OneNote is a database, not transactional database, but a freeform database none the less. In transactional database, you don't expose data for edits constantly. You have to press a button to add a new entry or update existing entry. The same should hold for OneNote."
This comment related to the ability to have most pages in lock mode or read only mode most of the time. At the page level itself one wants to make sure that deleting a whole page or even tree is non-trivial.
Thanks for considering my concerns.
JHM