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.
Despite the rather short battery life and confusing apps, the WD My Passport Wireless is an excellent mobile media drive, especially for photographers.
The SanDisk Connect Wireless Media Drive makes up for its slow USB speed by offering an excellent feature set and an SD card slot that will make most casual mobile users happy, especially photographers.
Synology DiskStation DS412+ makes an excellent NAS server for advanced home and small-office networks.
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.
It's not the fastest NAS, nor does it include many advanced features, but the WD My Cloud EX4 still combines great ease of use into an affordable personal cloud system that's excellent for a connected home.
Despite a few shortcomings, the Synology DiskStation DS411slim makes a worthy upgrade from its processor, the best-of-its-time DS409slim.
Roll your own cloud.
Despite a few shortcomings, the Corsair Voyager Air is an excellent way to extend your mobile devices' storage capacity and features.
The Synology DiskStation DS416play is a four-bay NAS server which uses an Intel Celeron processor and can transcode 4K video.
Not only is the Asustor AS-604T an excellent NAS server for serious network storage needs, it's also very easy to use thanks to the extremely well-designed user interface.
The QNAP TS-259 Pro is a dual-bay NAS server that offers great performance and features for a high premium. It's a device best suited for environments with high networking demand and for those who possess an intermediate to advanced know-how of networking.
The Netgear ReadyNAS NV+ offers a lot in the way of features and performance, which is good, because it's expensive.
Fast and relatively simple, the D-Link ShareCenter DNS-325 NAS server makes a good home network storage solution for data sharing, media streaming, and backups. Those who want more features and easier remote data access, however, should check out some alternatives.
The budget-minded Synology Disk Station DS214se is an excellent choice for home with casual backup, media-streaming, and data-sharing needs.
Next month, Synology will ship the new DS415play designed to handle full-HD media streaming with built-in media transcoding capability.
The QNAP TS-412 makes a very good NAS server for environments where advanced network storage is needed.
Given its relatively low price, the Seagate Business Storage 4-Bay NAS is worth the investment.