As a photo- and videographer I need a lot of backup. I currently have a 2tb Time Capsule which works well for computer back-ups, but not so well for storage. I decided to build a server, as absolutely cheap as possible. I have drives already; heres my plan: i want a Mac Mini, store it in a closet upstairs and connect 4 self-powered drives to it. With software I want to make a RAID-5 or 1. There is no ethernet, only wifi. And I want to be able to acces the Mini via screen sharing. What is the minimum of Mac Mini I need, the cheapest option? Are there things Im overlooking?