For the past while we uploaded the content of preservation in DuraCloud as the portal for DPN. DuraCloud can upload files from drag-and-drop, but a better way is with the DuraCloud synchronization tool. (The wiki had useful information in creating this). This synchronization tool can copy files from any number of local folders to a DuraCloud sspace, and can add, update, and delete files. I preferred the GUI version in one browser window and the DuraCloud account in another.