Sauvegarder, synchroniser, accéder, restorer ses données avec rsync
rsync copies only the diffs of files that have actually changed, compressed and through ssh if you want to for security
Rsync transactions without SSH are insecure because the protocol and the software itself does not include any content encryption. So if there is a man in the middle he can read/copy what you are backing up. Authentication can be read also
In daemon mode, rsync listens on the default TCP port of 873, serving files in the native rsync protocol or via a remote shell such as RSH or SSH.