For the education edition, the administrator can view it directly in the background. For the business edition, by default, the global administrator can access your OneDriveforBusiness or delete your OneDriveforBusiness file.

So, once again, don't store any personal data in OfB. It should be emphasized that this is not a security vulnerability of OfB. OfB is designed for organizations such as schools and enterprises, so it gives administrators the power to be compatible with organizational content. For personal use, please buy OneDriveforPersonal.