QNAP TS-453BU-4G 4-Bay Diskless NAS - Intel Celeron Apollo Lake J3455 Quad-core 1.5GHz (up to 2.3GHz) CPU - 4GB DDR3L SODIMM RAM ( 2x 2GB, max 8GB total) - 1U Rackmount - 4GB eMMC - 4x 2.5"/3.5" SATA 6GB/s, 3GB/s HDD/SSD - 4x USB 3.0 (Rear) - 4x Gigabit Ethernet - 1x HDMI 1.4b port - ATX 250W Power Supply - Rails not included - 3 Years Limited Warranty

Manufacturer Warranty: 3 Years Limited Warranty

Manufacturer Contact Info: https://www.qnap.com/i/au/,

The QNAP TS-453BU-4G 4-Bay Diskless NAS (TS-453BU-4G) is an enterprise-grade network storage solution built for small- and medium-sized businesses designed to provide fast and efficient performance for creating, managing, and restoring backups, or deploying network services for improved workgroup collaboration.  The QNAP TS-453BU NAS features a quad-core Intel Celeron J3455 1.5GHz processor, a 4GB system memory, four hot-swappable 3.5"/2.5" SATA drive bays, a PCI slot, an HDMI 1.4b interface, four rear USB 3.0 hubs, four Gigabit RJ45 Lan ports, and a 250W ATX power supply.
 

QTS operating system

QNAP's custom operating system implements a browser-based GUI for easy navigation.  It comes with QNAP's App Center which offers a wide array of software packages ready for installation and deployment on the TS-354BU NAS.  Download and install Virtualization Station and Container Station and host Linux, Windows, and UNIX-based operating systems for network use.
 

The QNAP TS-354BU 4-bay NAS is a versatile network-attached storage solution suitable for implementing various enterprise network functions for cross-platform file sharing, hosting virtual machines, email applications, data archiving, surveillance management, and many others.

Read more about the QNAP TS-453BU-4G 4 Bay Rackmount NAS on QNAP's site HERE.