Hello, 95% of my clients are Windows. I have a new customer that will probably about 95% mac. I usually set up Windows Servers for redundant power supply, active directory, raid 50 etc. I don't know if I need a server but I do want control of a personal drive and shared drive, easy control of folder access, RAID 50, about 4TB but easy to expand to 10TB. They do some video editing so they need a fast controller which most NAS boxes I've tried in the past were much slower than servers with LSI controllers. I'd like to enable time capsule type backups of the macs. Should I just stick with Windows server or is there a NAS box that can do everything they want?