If you're looking a small form factor NAS for your files, photos, and media, that supports Plex the DS923+ is a great device.
Synology DS923+ review
Synology DS923+ NAS Review
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Buy the Synology DiskStation DS423 4-Bay NAS Server, Quard Core 2GB RAM, 2x ( DS423 ) online - /pacific
Synology DS923+ 4-Bay NAS Review - Exterior