Cloud storage via FTP/SFTP/SSH (rsync, sshfs)/SCP?

Question

Data storage

Tell me, is it possible to implement cloud storage through any of the FTP / SFTP / SSH (rsync, sshfs) / SCP protocols? Of the requirements: the creation of users, each with their own files with the ability to share the necessary ones with other users, synchronization between them. Now owncloud is installed, but it requires the http protocol.