It is important to consider your OneDrive data when you are leaving Northwestern University. The data within OneDrive is permanently deleted after a certain period of time after your departure from the university.
It is recommended to transfer data from OneDrive into a SharePoint site that is managed by the school or unit to prevent any future loss of access. Files can be directly Move files and folders between OneDrive and SharePoint. If needed, you may also transfer files by way of OneDrive - Transferring Ownership of Files.
For more information about NetID Expiration please visit this website.