Hi all! Currently I have a 4.1 Mac pro with one 240GB SSD ( OS & applications ) and one 3TB drive ( photos, video, music, files etc. ) Im looking for a backup solution. Im thinking about buying one 5TB Seagate external to backup both drives, but I'm not shure 5TB is enough to backup both the 240GB SSD and the 3TB drive ? 6TB externals cost almost the double of a 5TB. What do you think?