I am currently using a WNDR3700 with a 1.5TB USB drive as a basic NAS on my network. I am doing windows 7 backups from 2 PCs on it as well as using it to store all my RAW files and dslr video files. I'm getting a MacBook pro this fall so I need to upgrade to something that will do time machine backups. I'm also not happy with the speed. Once I get my MacBook I'd also like to move a lot of my media files to the NAS for easy access across my devices and remotely. Im thinking 4tb may cover me but would like it to be upgradable. Ive build many windows boxes and 1 Linux box a few years back so would be comfortable DIY. I know very little about Macs and what it takes to make time machine work, so thought I would see what you guys on here recommend.