If anyone wants to know how to tar a folder, not just a file, do the following:
For this example I will backup the folder ROB which is an account
Login to your server through SSH
Enter "cd /home/ROB/"
Now enter "tar -zcvf filename.tar.gz *"
All files will now be put into a tar file and this will be shown on your SSH screen.
You can now login to your FTP and download the tar file which has everything which was inside the folder ROB
You can do this for any folder