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 myuser@server.domain.co:/home/myuser/file.txt ~/local-user/file.txt
$ scp ~/file.txt userssh@server.domain.co:/home/userssh/file.txt