Copy from remote server which doesn't have rsync

You can use scp -r to copy files recursively between different hosts. Your syntax could be like scp -r user@Ubuntu-Server:/home/myuser ./from_Ubuntu_server

Besides, you might be able to upload your local rsync binary using scp to the Ubuntu server and add the --rsync-path=/home/myuser/rsync to your original rsync command to let your client rsync know which rsync it should invoke on the Ubuntu server.

If you have the permission to use FUSE on your local machine, install the sshfs package. SSHFS lets you access remote files via normal filesystem access: it mounts a directory tree accessed over SFTP. You only need to have SFTP access on the remote side (which is enabled by default with OpenSSH on Ubuntu). Once the remote directory is mounted, you can use the tools of your choice to manipulate files, without having to care whether they're local or remote.

mkdir ~/net/remote-server
sshfs remote-server:/ ~/net/remote-server
rsync -a --no-copy-links ~/net/remote-server/remote/path/ /local/path/
fusermount -u ~/net/remote-server

You can use a tar and ssh combination like this:

tar cvzf - folder/ | ssh -C user_name@host_name "cd ~/; tar xvzf -"