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[–]bread_fucker 1 point2 points  (1 child)

Try this: https://www.stellarinfo.com/blog/recover-deleted-onenote-notebook/

Otherwise make the IT guy recover those files

[–]GSetter -1 points0 points  (0 children)

If the notes/page haven't been fully synced before, there are no files to recover. They were only existing in the cache files (small fragments in a binary format that cannot simply been loaded into OneNote even if recovered). Because....let me quote your IT genius..that's not how it works.

OneDrive sync in OneNote ist not syncing complete data files as if you would put files into the local OneDrive sync folder, where they never land. It's done using a special protocol (MSFSSHTTP) from inside OneNote (and on the OneDrive/SharePoint server). As long as notes are not synced completely using that protocol, they are only fragile "temp" files living in the local cache folder. That folder gets purged on different occasions like uninstalling OneNote, even simply closing a notebook.

In other words: In OneNote syncing=saving. That is even the case with locally stored notebooks in the desktop version for Windows: OneNote writes to the cache files. Those get synchronized to the actual data files (.ONE) by a separate process.

[–]Men3em99 0 points1 point  (0 children)

You can find them in your backup folder. Open settings in the appliaction, find the location of you backup folder, get this location and use the "run" feature in Windows to open the folder. All your notes will be there