Apple AirPort Time Capsule ( 3TB, 802.11ac)
As long as you don't need expert-level features, the 2013 AirPort Time Capsule is an excellent backup/file server for Apple fans -- especially for those with 802.11ac-enabled Macs.
Synology DiskStation DS1513+
The Synology DiskStation DS1513+ is easily one of the best multiple-bay NAS servers to date, performing superbly both as an advanced storage server and as the central host for a long list of home entertainment and business uses.
Seagate Business Storage 4-Bay NAS ( 16TB)
Given its relatively low price, the Seagate Business Storage 4-Bay NAS is worth the investment.
Corsair Voyager Air ( 1TB, Black)
Despite a few shortcomings, the Corsair Voyager Air is an excellent way to extend your mobile devices' storage capacity and features.
Thecus Technology N4800Eco
If you're in the market for raw speed and lots of storage space, the N4800eco will deliver, but those wanting more should keep looking.
Synology DiskStation DS213Air
The Synology DiskStation DS213Air is a great network storage device for home users, especially those who also want to extend their Wi-Fi network.
QNAP TS-469 Pro NAS server
The QNAP TS-469 Pro is one of the best four-bay NAS servers on the market and will eventually justify the price you pay for it.
Synology DiskStation DS412+
Synology DiskStation DS412+ makes an excellent NAS server for advanced home and small-office networks.
Synology DiskStation DS712+
The DiskStation DS712+ is one of the best dual-bay NAS servers on the market, for both home and office environments. It's also one of the few that offer storage scalability for those who want to start small and add more capacity later.
NetGear ReadyNAS NV+ v2 ( 4TB)
The Netgear ReadyNAS NV+ v2 makes a decent NAS server for homes and small offices that need lots of storage space.