SFTP/SSH conenciton. Not all personal/own cloud devices have webdav capabilities. But all of them have SFT/SSH option. If you can add this option will be awesome. We all know the cloud providers might access your data and try to hack it even if is encrypted. I trust more my own NAS device in my home than any cloud provide. My NAS works with webDa but only if I use the apps from the manufacture and I cannot connect via safeincloud app ( certificate invalid via https) plus SSH is way more secure, even it might be a bit slower.