Hi, a friend of mine wants to set up a shared hard drive at home for backup and centrally storing files/photos. They have a couple of MacBooks, iPhones, iPads and an iMac. They're non technical so they need an easy to use solution, with raid redundancy for ease of mind, capacity I'm looking at 2 to 4 GB. I've been looking at these drives, Synology DiskStation, Western Digital My Book Live, IOMEGA Home Media Network Hard Drive and Seagate BlackArmor NAS 110. Any recommendations/suggestions? Thanks.