I currently have my Mini serving as my HTPC running Plex on it with external HDD's connected. I want to set up a RAID5 array with 4 drives in the future. Here are some questions I had 1) Should I just get the Synology 414j or 415play and hook it up to my router? I would initially have a 2TB and a 4TB, and eventually add more 4TB as time goes on. 2) I could get a OWC 4bay Qx2 4-bay and hook it up to my Mini via USB3.0. Could I start with 2x4TB drives in RAID 1, then later on add a 3rd and do RAID5, then eventually add another? Could I do all this without having to format? #2 is the cheaper route, but I want to know if I can change the RAID array as time goes on. I have heard great things about Synology, but since I have the Mac Mini would a NAS be necessary? If I went with the second option, I would install OSX Server and set up file sharing. This is mostly to stream my library through Plex to my Fire TV, Chromecast, and my Macbook. Also I would use it to back up my 2 laptops.