Hi @leefur,
odrive supports protocols such as WebDAV, FTP, and SFTP. Many folks use these capabilities to connect to their own storage.
For Windows systems, there is a guide here on setting up WebDAV: How do I setup a WebDAV Server on Windows and link it to odrive?
For Mac and Linux systems, they already have SSH built-in, so SFTP can be used pretty quickly if you are wanting to test things out.