====== File Synchronisation and Backup ======

===== Backup a remote directory over ssh using the wondertar =====

tar a remote directory and all content to the local machine over ssh without using disc space on the remote server. This is also called the "wondertar" or "wonder tar".
<code bash>
ssh user@remote-machine -p <port> "tar czpf - /remote/directory/source" | tar xzpf - -C /local/directory/target
</code>
And the other direction local to remote directory.
<code bash>
tar cpf - /local/directory/source | ssh user@remote-machine -p <port> "tar xpf - -C /remote/directory/target" 
</code>
[[https://meinit.nl/using-tar-and-ssh-to-efficiently-copy-files-preserving-permissions]]