Synology

A Synology NAS device is essentially a server.  To get an idea of how many things it can do in addition to storing files and streaming media, go here, then click PACKAGES.

 

Diskstation DS-216+II

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Featuring a dual-core CPU with AES-NI hardware encryption engine, Btrfs file system support, and 4K UHD transcoding, DS216+II is a high-performance 2-bay NAS server aimed at small office and home users who want an efficient and secure storage solution to protect and share data, as well as enjoy on-the-fly video transcoding. All you do is install one or 2 hard disks, for up to 20 TB, with RAID 0 or 1 if you like, and you are off and storing.

RS815+

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Powered by a quad-core CPU running at 2.4 GHz, RS815+/RS815RP+ delivers average 389.03 MB/s reading and 361.33 MB/s writing.1 With this superior performance and a RAM module expandable to 6GB (2GB by default), RS815+/RS815RP+ is a powerful 1U NAS server for mission-critical tasks of SMBs. Add up to 40TB between 4 drive bays in RAID 0, 1, 5, 6, and 10 among others and your data is secure and quickly accessed. The RS815RP+ includes redundant power supplies.