Good day. I would like some help on purchasing a backup plan for my files and I would like your help. First, I currently have a 160HD mac and 2 250gb external drives, one I use to backup my Mac and the other one I have several types of files. My two problems are, I keep getting more files so I don't want to keep buying external drives, and I would like to have a backup of the external files on this second drive. Some friends have suggested RAID, but I have no idea how that works only that a friend suggested a 4x400gb raid station for 1200 dollars new. Please HELP! I don't want to have a chance of loosing any files! Thanks, Kiko.