Make offline folders for a desktop PC
I use OneDrive for most of my files, because I can so easily sync it with my computer. And I can navigate the file structure with File Explorer offline. It is so easy to drag files around quickly to organize my documents.
For all the faults that Microsoft Onedrive has, the ability to use it with Desktop Explorer and control which files and directories are cloud-only or cloud and local is very nice. The ability to use my backup software to back files directly to the cloud using Windows Explorer with Onedrive makes automated backups easy.