The TS-251B combines secure data storage and multimedia entertainment into one device. Featuring a PCIe slot, the TS-251B is QNAP’s first home/SOHO NAS that allows you to flexibly extend its functionality and potential applications. You can install a QNAP QM2 card to provide M.2 SSD caching/10GbE connectivity and use with Qtier auto-tiering storage to enhance overall system performance; or install a wireless network card (such as the QNAP QWA-AC2600) to turn the TS-251B into a wireless access point and to wirelessly stream your multimedia throughout your home. The TS-251B supports dual-channel H.264 hardware decoding and transcoding, allowing you to enjoy watching NAS media files smoothly across various devices.

	The PCIe port supports installing a 10GbE network card, a QM2 dual-port M.2 SSD/10GbE card, a USB 3.1 Gen 2 (10Gbps) card, or a wireless network card.
	4K media playback and online transcoding; cross-device multimedia viewing via HDMI output or streaming applications.
	Snapshots fully record the system status and data. If files are accidentally deleted or modified, you can quickly restore the previously-recorded data.
	Hybrid Backup Sync consolidates backup and sync tasks into a single app, providing multiple layers of data protection.
	Remotely access the apps and files on your TS-251B via myQNAPcloud and easily manage and share files.
	Supports containerized applications and hosting virtual machines with various operating systems.

Intel® Celeron® J3355 dual-core processor and AES-NI hardware encryption

Powered by a 14nm Intel® Celeron® J3355 dual-core 2.0GHz processor (burst up to 2.5 GHz), 2GB/4GB DDR3L RAM (up to 8GB), a single Gigabit LAN port, and supporting SATA 6Gb/s hard drives, the TS-251B provides dependable performance of up to 672 MB/s read/write speeds. The TS-251B features Intel® AES-NI hardware-accelerated encryption for both full NAS volumes and shared folders, boosting system performance while ensuring the security of sensitive data stored in the TS-251B.

File Transfer (1 x 10GbE)

Winddowns Download: 647 MB/s     Windows Upload: 519 MB/s

File Transfer with Encryption (1 x 10GbE)
Winddowns Download: 615 MB/s     Windows Upload: 320 MB/s

Sequential Throughput (1 x 10GbE, 64KB)
Winddowns Download: 672 MB/s     Windows Upload: 453 MB/s
*Tested in QNAP Labs. Figures may vary by environment.

Test Environment:
NAS: TS-251B
OS: QTS 4.3.4
Volume type: RAID 0; 2 x Intel S3500 240GB SSDs (SSDSC2BB240G4); QNAP LAN-10G2SF-MXL 10GbE SFP+ adapter
Client PC: Intel® Core™ i7-4770 3.40GHz CPU; 16GB DDR3L-1600; WD 1TB WD10EZEX; RAMdisk; QNAP LAN-10G2SF-MXL 10GbE SFP+ adapter; Windows® 10 64-bit

Extend NAS functionality with the PCIe slot

With a PCIe expansion slot, the TS-251B provides flexibility in extending NAS functionality and potential applications. Install a QNAP QM2 card to provide M.2 SSD caching/10GbE connectivity and use with Qtier tiered storage for optimal system performance; use the TS-251B as a wireless access point by installing a compatible wireless network card (such as the QNAP QWA-AC2600) to create a wireless media streaming environment; or boost the USB connectivity of the TS-251B by installing a USB 3.1 Gen 2 (10Gbps) card.

A tailor-made private wireless network that meets your needs

By installing the QWA-AC2600 and WirelessAP Station app, your NAS will evolve into a high-performance wireless access point that can be connected to from multiple devices. The QWA-AC2600 can also be used to extend your wireless network coverage. Combined with useful features (including DHCP and NAT) provided by the Network and Virtual Switch app, the QWA-AC2600 can be used for a variety of applications, delivering private, fast, low-latency and secure connectivity across your home and/or workplace. (WirelessAP Station requires Container Station to be installed on your QNAP NAS.)
Boost your Wi-Fi coverage
Deploy your QNAP NAS as a wireless access point to improve coverage. With the QWA-AC2600 and the WirelessAP Station app, your NAS is transformed into a high-performance wireless access point. Just place the NAS in a more centralized location and it will help lengthen the reach of your existing Wi-Fi network and eliminate potential dead zones.
Directly access your NAS
With the QWA-AC2600 and the WirelessAP Station app, your NAS can perform as a high-performance wireless access point that can be accessed by multiple devices. Your devices can directly access data stored on the NAS and in bypassing the router, access speeds to the network will not be affected.

Upgrade your network to 10GbE with QNAP's fast and affordable 10GbE Switch

QNAP 10GbE/NBASE-T™ unmanaged switches allow you to instantly upgrade your network environment at a cost-effective price. With a 10GbE network you can enjoy blazing-fast transfer speeds, empower bandwidth-demanding tasks like virtualization, and enable simultaneous real-time access to large NAS-based files using multiple workstations (ideal for video editing and multimedia). QNAP also provides a 10GbE PCIe network expansion card for the TS-251B and Windows®/Linux® PCs to take advantage of high-speed LAN environments.

Real-time 4K video transcoding

Featuring advanced Intel® HD Graphics, the TS-251B supports dual-channel 4K H.264 hardware decoding and real-time transcoding, allowing you to convert videos to universal file formats that can be smoothly played across various devices*. You can also watch high-quality 4K@30FPS media files on a HDTV using the HDMI output or use with Plex® Media Server to stream media files to mobile devices and media streaming devices (including DLNA®, Roku®, Apple TV®, Amazon Fire TV® and Chromecast™). The QNAP RM-IR004 remote control (sold separately) can be configured using QButton to customize the actions of individual buttons, providing a more convenient NAS experience.
*The TS-251B’s hardware provides H.264 hardware decoding, encoding and transcoding capabilities. However, playback quality may vary due to factors including playback software, file formats, system usage, and available bandwidth.

Multiple ways to enjoy your multimedia

QNAP provides a wide range of multimedia applications for you to easily enjoy photos, music, and videos.

	Cinema28 allows for single-interface management of all your media files and can stream files to every connected device throughout your home.
	QVHelper allows users to stream media files or music playlists from a QNAP NAS to VLC player.
	Qmedia allows music, photos and videos to be effortlessly streamed to Android TVs or set-top boxes.
	Video HD is a free KODI add-on that combines KODI's streaming and video decoding capabilities and fully supports Video Station's features.

Protect important data with snapshots

Snapshots help protect your data by fully recording the NAS system state and metadata. If files are accidentally deleted or modified or the system is afflicted by ransomware, you can use snapshots to quickly restore files to a previously-recorded state. QNAP snapshots are block-based and only record the changed data. Not only does this save storage space but also reduces the time required to back up and restore data. The TS-251B supports up to 1,024 snapshots per NAS and up to 256 snapshots per volume or LUN.

Consolidated notifications and extra NAS security

QTS 4.3.5 provides various mechanisms to ensure the data saved on your TS-251B is carefully safeguarded, including the brand-new Notification Center that consolidates system logs and notifications into a single app and the Security Counselor that checks for weaknesses and offers helpful security recommendations.

	Notification Center Consolidates system logs and notifications for all NAS apps into a single app with flexible rule settings, facilitating smooth and easy NAS management.
	Security Counselor Checks for weaknesses and offers recommendations to enhance NAS security. Anti-virus and anti-malware software is also integrated within Security Counselor to ensure the complete protection of your NAS and data.

Automate everyday tasks with IFTTT Agent

QNAP IFTTT Agent integrates the popular web automation service IFTTT (If This Then That), allowing you to create a near-unlimited number of automated workflows. Simply connect your IFTTT account with your TS-251B and set triggers and actions. For example, if you set a trigger as “Any new photo on the phone” and the action as "Upload the photo to QNAP NAS," then all the photos taken using your phone will be automatically uploaded to TS-251B.

Multiply your productivity

The app-driven QTS operating system provides solutions for simplifying file backup, management, search, and more. With File Station you can view and manage your files not only from NAS but also from multiple storage devices; the OCR Converter allows you to extract text from images; Qfiling helps automate file organization, and Qsirch helps quickly find files.

	Centralized File Management Use File Station to directly access files on USB devices - including optical disc drives. Files from different devices can be easily viewed and managed on a single interface.
	File Digitization OCR Converter extracts text from images, helping to boost productivity and making it easier to find files.
	Smart Filing Qfiling automates file organization. Files are automatically archived into folders based on your settings.
	Full-text Search Qsirch quickly finds images, music, videos, documents, emails, and other files.

Multi-point file backup, access and sync

The TS-251B centrally stores data and files, and supports SMB/CIFS, AFP and NFS protocols for file sharing across Windows®, Mac®, and Linux®/UNIX® devices. Coupled with Qsync (a utility that turns a QNAP NAS into a safe, high-capacity data center for file synchronization) any file uploaded to the TS-251B will be made available for all linked devices, such as computers, laptops and mobile devices. Hybrid Backup Sync can help you easily backup or synchronize data on the TS-251B to other QNAP NAS, remote servers, or cloud storage for easy disaster recovery.

QVR Pro safeguards your environment

QNAP’s QVR Pro surveillance solution allows you to arrange a dedicated, independent storage space for surveillance data on TS-251B and leverage the advantages of scalable storage. With QVR Pro, camera management, storage space allocation, camera live view, and playback is greatly simplified. You can also use USB webcams as network cameras with the QUSBCam2 app, and remotely monitor your surveillance feeds at any time with QVR Pro Client’s companion mobile app.
*The maximum number of channels supported varies by NAS model, network configuration, and camera settings.
1. 5,000+ compatible IP cameras.
2. 8 free IP camera channels.
3. 128 max. IP camera channels
4. QUSBCam2 record from USB webcams.

NAS as a Multi-OS Platform

Virtualization Station and Container Station provide comprehensive solutions for creating virtualized environments to improve business IT infrastructure, workflows, and productivity.

	Virtualization Station Virtualization Station allows you to run multiple Windows®, Linux®, UNIX® and Android™ virtual machines on the TS-251B. You can use Virtual Network Computing (VNC) through a browser to operate the virtual machines. Virtualization Station is ideal for organizations to run multiple applications on a single NAS.
	Container Station Container Station integrates LXC and Docker® lightweight virtualization technologies. You can download apps from the built-in Docker Hub® to easily import/export container apps and manage access control, enjoying the benefit of easy installation, transferability and high-efficiency.

Flexible and economical storage expansion

You need an easy solution to increase storage capacity when running out of space. QNAP provides several ways to expand your NAS storage as needed to accommodate data and business growth

	Attach Expansion Enclosures Connect two 4-bay TR-004 USB hardware RAID external enclosures and use the Storage & Snapshots Manager to easily handle NAS capacity expansion.
	VJBOD Use VJBOD (Virtual JBOD) to expand your storage capacity by using the unused storage of other QNAP NAS. Up to 8 QNAP NAS can be mounted as local disks on the TS-251B.
	Upgrade RAID Capacity Hot swap lower-capacity drives with larger-capacity drives so that your QNAP NAS can grow with your business.

Available Model

TS-251B-2G: 2 GB SO-DIMM DDR3L (1 x 2 GB)
TS-251B-4G: 4 GB SO-DIMM DDR3L (1 x 4 GB)

Hardware Spec.

Note: Use only QNAP memory modules to maintain system performance and stability. For NAS devices with more than one memory slot, use QNAP modules with identical specifications. Warning: Using unsupported modules may degrade performance, cause errors, or prevent the operating system from starting.
* Sound Level Test Environment: Refer to ISO 7779; Maximum HDD loaded; Bystander Position; Average data from 1 meter in front of operating NAS. Designs and specifications are subject to change without notice.

QNAP Utilities

Discover new and convenient ways of using your NAS with QNAP Utilities. From quick set up, to easy access, secure back ups, fast restoration, simple file sharing and synchronization - there's a utility for all of your everyday tasks. There are also specialized utilities to assist with optimal management of virtualization environments and surveillance systems. Check out the QNAP Utilities now.

Essentials

Qfinder
Qfinder Pro (available for Windows, Mac and Ubuntu) allows you to quickly find and easily access all of the QNAP NAS on the same LAN. The Windows version provides “Storage Plug & Connect” functionality, allowing the QNAP NAS to be used as a PC network drive or virtual disk for convenient data storage. You can also use the "Media Upload" feature to save NAS system resources by performing media file transcoding on your local PC before uploading them to the NAS. Chromebook users can download Qfinder Pro from the Chrome Web Store to enjoy seamless connectivity to the QNAP NAS.
Available :

Qsync
Qsync enables automatic file synchronization across different devices. Simply drag and drop files in the “Qsync folder,” data on devices linked with the NAS is updated simultaneously when changes are made. Additional sync modes, such as Smart Sync or Advanced Selective Sync, allow users to only sync selective data or folders. You can also create download links to share files with others without them having to create a user account for download.
Available :

QNAP External RAID Manager
With the QNAP External RAID Manager you can set up, monitor, and view the status of your QNAP external RAID devices (such as the TR-004). All device events are recorded and desktop notifications will be sent if a system alert occurs.
Available :

QVPN Devcice Client
The QVPN Device Client is a powerful tool that allows VPN connections directly to your QNAP NAS via the proprietary QBelt protocol. With the built-in speed measurement tool, you can also easily know the VPN connection speed, and query all the historical connection records at any time.

Available :*NAS system requirements: requires QTS 4.3.5(or later) and QVPN 2.0 to enable the QBelt protocol.

vSphere (Web) Client plug-in
QNAP NAS supports vSphere Client plug-in that allows direct management of the VMware datastores on the NAS from the vSphere client console. In a large-scale virtual server environment, management is centralized and straightforward. Administrators can easily control the status of the QNAP NAS and datastores and create additional datastores to multiple ESXi hosts within just a few clicks.Available :
Limitations: This utility is only available for Enterprise and SMB-class models.

Q'center Virtual Appliance
Q’center is a powerful centralized QNAP NAS management system. The Q’center Virtual Appliance can be deployed in Microsoft Hyper-V or VMware ESXi to increase system flexibility and connectivity for large storage environments.
With Q’center, users can view the status and system information of multiple QNAP NAS on a single platform, at the same time inspecting system resource usage, monitoring disk/ volume health and performing other management tasks. With these features on Q’center, IT administrators and QNAP NAS users can better allocate system resource and plan for future capacity.Limitations: Minimum requirements: 108 GB free disk space, 1 GB memory and 4 virtual CPUs
Supported platforms: VMware ESXi (ESXi 5.0, ESXi 5.1, ESXi 5.5), VMware Fusion 7, VMware Workstation 11, Microsoft Windows Server 2012 R2 with Hyper-V 3.0.
This utility is only available for Enterprise and SMB-class models.

QNAP Snapshot Agent
The Storage Manager's Snapshot function supports iSCSI LUNs to rapidly back up and restore data. When creating a LUN snapshot, QNAP Snapshot Agent for Windows Server or VMware vCenter allows the NAS to communicate with the remote server when taking snapshots and ensures Application-consistent LUN snapshots.
Available :VSS Hardware Provider also allows NAS ROW (Redirect on Write) instead of Windows COW (Copy on Write) to increase backup efficiency and to offload the snapshot to the NAS for reducing the performance impact on the Windows server.

Limitations: For Snapshot Agent's system requirements and limitations.
This utility is only available for Enterprise and SMB-class models.

Surveillance

QVR Pro Client
The optimized QVR Pro Client software consolidates live monitoring with quick playback functionality in a single view. You can browse multiple channels at once, enjoying efficient and easy management of surveillance videos.
Available :

QVR Client
QNAP QVR Client is a client application that allows users to easily configure recording settings of the IP cameras, while also providing local or remote access to QNAP NAS for video monitoring and playback.
Available :