Open the notebook where you lost recent notes. Choose File > Info > Open Backups. In the Open Backup dialog box, note the folder names that appear. Each folder represents a OneNote notebook that’s stored on your computer. Double-click the notebook folder you want to open.

Delivery Optimization in Windows 10 clears its cache automatically. Files are removed from the cache after a short time period or when their contents take up too much disk space. However, If you need more disk space on your PC, you can clear the cache manually.

Follow these instructions to manually recover a OneNote 2016 or prior notebook that may have become lost when opened in OneNote for Windows 10. In File Explorer, go to: C:\Users\ [user name]\AppData\Local\Packages\Microsoft.Office.OneNote_8wekyb3d8bbwe\LocalCache. [user name] is your Windows login name. Each folder name is a notebook's name.

Use this app to try to recover lost files that have been deleted from your local storage device (including internal drives, external drives, and USB devices) and can’t be restored from the Recycle Bin.

Learn how to delete and restore files in OneDrive. Recover deleted files or folders from the OneDrive recycle bin.

Search for your files on OneDrive.com. If you need to search all files and folders, but you have Files On Demand enabled or you're only syncing certain folders, you can do your search online. Sign in to the OneDrive website at https://www.onedrive.com. Use Search everything to look for your files.

Learn how to recover files that have been lost, deleted, or accidentally changed.

Select Storage. Highlight but don’t select a storage device, and then press the Y button on your controller for Device Options. Note It doesn't matter which storage device you choose. This clears the cache for all storage devices. On the Device Options screen, select Clear System Cache.

Manage. Restore your OneDrive. OneDrive (work or school) OneDrive (home or personal) More... OneDrive's Restore your OneDrive feature helps Microsoft 365 subscribers undo all the actions that occurred on any files and folders within the last 30 days.

If your notebooks are cloud-based (saved to OneDrive or to SharePoint Online), you can reclaim storage space on your computer or device without permanently deleting any of your notebook content. If you have run out of space on OneDrive or SharePoint, you’ll see an error about “Quota Exceeded.”