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OneNote caches all the notebooks opened from non-local sources. If you start noticing syncing errors or performance issues, closing the notebook and deleting its cache will bring down a fresh, and smaller, copy from the source. These instructions pile up over time and can become corrupt. This cache file also keeps track of changes made in the notebook to allow for it to sync back up when connected to the Internet.
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When OneNote opens a notebook from a shared drive, OneDrive or SharePoint, it copies those files to the local computer. Working locally on a OneNote notebook opened from the cloud or a fileshare can mean you're working on three. The culprit? All those useful OneNote notebooks. Once these lawyers started to get updated computers with fancy solid-state drives, we started to see a problem. They keep important client data spread out among ten massive notebooks.
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