SSH authentication is required!
source: https://linuxize.com/post/how-to-use-scp-command-to-securely-transfer-files/
scp [OPTION] [user@]SRC_HOST:]file1 [user@]DEST_HOST:]file2
$ scp [email protected]:/home/myuser/file.txt ~/local-user/file.txt$ scp ~/file.txt [email protected]:/home/userssh/file.txt