The scanner is an Epson ES-580W, but any model would be adequate that can scan directly to a network folder by FTP or FTPS over wifi or ethernet. Some are claimed to support SFTP but I think the copywriter meant FTPS. They seem to follow the network protocol standards well enough to work with Linux even without any special drivers. Although the scanner interacts with my file server, I prefer to run paperless-ngx on my desktop, so an incron job runs on the file server to copy the scanned documents to the desktop if the latter is on line but retain them otherwise, and a startup script on the desktop copies the retained scanned documents from the file server whenever the desktop boots.