If remote login is not enabled on Mac, SSH connection will fail:
~/Videos$ scp -r MyDir/ user@192.168.0.30:/Users/user/Movies
ssh: connect to host 192.168.0.30 port 22: Connection refused
lost connection
We need to enable remote login on Mac (System Preferences >> Sharing):
~/Videos$ scp -r MyDir/ user@192.168.0.30:/Users/user/Movies
The authenticity of host '192.168.0.30 (192.168.0.30)' can't be established.
ECDSA key fingerprint is SHA256:fvlF0KH/l1N/fHmg4etTM/OR9DJYl1mnzD2iD43R+j5.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '192.168.0.30' (ECDSA) to the list of known hosts.
Password:
file1.m4v 100% 137MB 1.6MB/s 01:28
file2.m4v 100% 151MB 1.5MB/s 01:40
Files are copied to /Users/user/Movies/MyDir/.