This guide offers solutions for those who are missing some or all of their OneDrive files and folders on their PC. There are several reasons why OneDrive files may disappear, such as accidental deletion, enabled Files On Demand, interrupted backup processes, or corruption in the app. To recover missing data, users can manually search for files on OneDrive Live, check the Recycle Bin on OneDrive, check the Personal Vault folder, start OneDrive backup manually, change Indexing Options, reset OneDrive, use a data recovery tool, or reinstall OneDrive. If files are not permanently deleted, they can be recovered within 30 days from the Recycle Bin folder.