Copying a file to the remote system

scp file user@host:/path/to/file

Copying a file from the remote system

scp user@host:/path/to/file /local/path/to/file

Copying multiple files

scp file1 file2 user@host:/path/to/directory

Copying an entire directory

scp -r /path/to/directory user@host:/path/to/directory

Conditions

-r      # transfer directory 
-v      # see the transfer details
-C      # copy files with compression
-l 800  # limit bandwith with 800
-p      # preserving the original attributes of the copied files
-P      # connection port
-q      # hidden the output