SSH is a really cool protocol to play with files, you can use scp command to upload and download files from server.
Upload file from local to remote server
scp /path/to/local/file user@host:/path/to/remote/file
Upload file from one server to another
scp user1@host1:/path/to/file user2@host2:/path/to/other/file
Downloading file from remote server to local system
scp user@host:/path/to/remote/file /path/to/local/file