i have created a website that only runs on my local network that i stream movies and such to my iPad and appleTV. this is running off a mac mini with a 4 TB drive hooked up to it. however, the 4 TB drive is getting full. is there a better way to expand my storage without a raid system? basically, i want to be able to continue to grow in the future. i'm thinking i have 2 options: 1. buy a drobo 5D and expand the store as needed. it will have one volume that is bigger than 4 TB and will continue to grow as hard drives get bigger. 2. buy another 4 TB drive and re-organize the url structure of the site to divide the data on two volumes. much harder to keep straight and harder to expand in the future, but much cheaper. any thoughts?