For anyone prioritizing secure, encrypted document storage, choosing the right 4-bay NAS is essential. The best overall pick in 2026 is the Synology DS925+, known for its robust encryption features and user-friendly interface. The QNAP TS-462A-4G stands out for its strong performance and versatility, while the Terramaster F4-425 offers great value for tech-savvy users. Each option comes with tradeoffs, such as cost versus features or ease of setup versus advanced customization. Continue reading for a full breakdown of these options and what to consider before buying.
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Key Takeaways
- Encryption features vary significantly, with some NAS devices offering hardware-accelerated encryption for faster performance.
- Ease of setup and management is crucial for beginners, and brands like Synology excel in this area.
- Performance in multi-user environments depends on CPU and RAM, making higher specs essential for busy or enterprise users.
- Value is often tied to expandability and included features; budget options may lack advanced security tools.
- Compatibility with third-party security tools can enhance encrypted storage but might require technical expertise.
| Synology DS423 4-Bay Diskless NAS for Backup, File Sharing, and Video Surveillance |  | Best Overall for Versatility and User-Friendly Features | Brand: Synology | Model Number: DS423 | Number of Bays: 4 | VIEW LATEST PRICE | See Our Full Breakdown |
| Synology 4-Bay DiskStation DS925+ (Diskless) |  | Best for Scalability and Advanced Data Management | Model: DS925+ | Drive Bays: 4-bay | Maximum Drive Support: 9 drives with expansion | VIEW LATEST PRICE | See Our Full Breakdown |
| TERRAMASTER F4-425 4-Bay NAS Intel x86 Quad-Core CPU 4GB RAM (Diskless) |  | Best for Power and Hardware Flexibility in Encrypted Storage | Processor: Intel x86 quad-core | RAM: 4GB | Storage Capacity: up to 120TB | VIEW LATEST PRICE | See Our Full Breakdown |
| UGREEN NAS DXP4800 Pro 4-Bay for IT Professionals, Developers & Power Users |  | Best for Enterprise-Grade Security and Advanced Workflows | Processor: Intel Core i3-1315U | Memory: 8GB DDR5 (expandable to 96GB) | Storage Capacity: 144TB | VIEW LATEST PRICE | See Our Full Breakdown |
| Asustor Lockerstor 4 Gen2+ AS6704T v2 4-Bay NAS |  | Best for Media and Hybrid Storage with Encrypted Capabilities | Processor: Intel Celeron N5105 | Memory: 4GB DDR4 (expandable to 16GB) | Storage Bays: 4 | VIEW LATEST PRICE | See Our Full Breakdown |
| Synology DS425+ 4-Bay Diskless NAS Private Cloud Media Server |  | Best Overall for Small Business Encryption and Security | Number of Bays: 4 | Type: Diskless NAS | Data Transfer Speed: 278 MB/s | VIEW LATEST PRICE | See Our Full Breakdown |
| QNAP TS-462A-4G 4-Bay Desktop NAS |  | Best for High-Performance Multimedia and Flexible Storage | Number of Bays: 4 | Processor: Intel Quad-Core up to 2.9 GHz | Memory: 4 GB DDR4 (expandable) | VIEW LATEST PRICE | See Our Full Breakdown |
| Synology DS225+ Private Cloud Media Server – 2-Bay Diskless NAS with Intel CPU |  | Best for Home and Small Office Privacy and Simplicity | Storage Bays: 2 | CPU: Intel | Transfer Speed: 282 MB/s | VIEW LATEST PRICE | See Our Full Breakdown |
| 4-bay NAS for encrypted document storage | Warranty | Network Ports | Processor |
|---|---|---|---|
| Synology DS423 4-Bay Diskless | 2 years | — | — |
| Synology 4-Bay DiskStation DS9 | 3 years | 2 x 2.5GbE | — |
| TERRAMASTER F4-425 4-Bay NAS I | — | — | Intel x86 quad-core |
| UGREEN NAS DXP4800 Pro 4-Bay f | — | 10GbE + 2.5GbE | Intel Core i3-1315U |
| Asustor Lockerstor 4 Gen2+ AS6 | — | 2 x 5GbE | Intel Celeron N5105 |
| Synology DS425+ 4-Bay Diskless | 3 years | — | — |
| QNAP TS-462A-4G 4-Bay Desktop | — | 2 x 2.5GbE | Intel Quad-Core up to 2.9 GHz |
| Synology DS225+ Private Cloud | 3 years | — | — |
More Details on Our Top Picks
Synology DS423 4-Bay Diskless NAS for Backup, File Sharing, and Video Surveillance
The Synology DS423 stands out for offering a well-rounded package that combines reliable data backup, seamless file sharing, and integrated surveillance support, making it ideal for small offices or advanced home users. Compared to the more enterprise-focused UGREEN DXP4800 Pro, which delivers higher performance and expandability, the DS423 remains accessible with a simpler setup, though it requires separate licenses for surveillance cameras. Its versatile four-bay design supports various RAID configurations, enabling flexible data protection. However, the absence of included camera licenses and potential complexity for beginners are tradeoffs to consider. This model suits users seeking a straightforward, all-in-one NAS with security features without the higher cost or technical demands of enterprise solutions.
Pros:- Versatile storage capacity across four bays for flexible data management
- Supports comprehensive backup and file sharing solutions
- Built-in surveillance tools for monitoring up to 30 cameras
Cons:- Requires separate purchase of camera licenses for surveillance
- No included price information, which can be a consideration for budget planning
- Potential complexity for users unfamiliar with network storage systems
Best for: Small business owners or tech-savvy home users needing integrated backup, file sharing, and surveillance.
Not ideal for: Complete beginners or those seeking plug-and-play simplicity without additional licensing or setup complexity.
- Brand:Synology
- Model Number:DS423
- Number of Bays:4
- Warranty:2 years
- Item Type:NAS
- UPC:846504004911
Our verdict“This NAS is best suited for users wanting a versatile, feature-rich platform that balances ease of use with multi-functionality.”
Synology 4-Bay DiskStation DS925+ (Diskless)
The Synology DS925+ makes this list for its support for up to nine drives with expansion, ideal for users planning long-term growth or larger encrypted storage needs. Its dual 2.5GbE ports provide fast network speeds, making it suitable for high-throughput tasks like encrypted data transfers. Compared with the Terramaster F4-425, which offers powerful hardware but less expandability, the DS925+ emphasizes flexibility through its support for additional drives and virtualization features. Its setup may require technical knowledge, and it lacks included drives, adding to initial costs. This device suits users who expect their storage needs to grow and prioritize scalability alongside security.
Pros:- Supports scalability with up to 9 drives for future growth
- Fast data transfer with dual 2.5GbE network ports
- Built-in solutions for data sharing, backup, and surveillance
- Powered by Synology DiskStation Manager for flexible management
Cons:- Requires technical setup and configuration experience
- Additional cost for drives, as it does not come with pre-installed storage
- Higher price point reflecting advanced features
Best for: IT professionals or small business owners looking for expandable, high-performance NAS with encryption capabilities.
Not ideal for: Less technical users or those with small, static storage needs who prefer simpler setups without expansion concerns.
- Model:DS925+
- Drive Bays:4-bay
- Maximum Drive Support:9 drives with expansion
- Network Ports:2 x 2.5GbE
- Warranty:3 years
- UPC:846504006007
Our verdict“This NAS is ideal for users with growing storage needs who want a flexible, manageable platform for encrypted data and multiple functionalities.”
TERRAMASTER F4-425 4-Bay NAS Intel x86 Quad-Core CPU 4GB RAM (Diskless)
The TERRAMASTER F4-425 offers a robust hardware platform with a quad-core Intel x86 processor and 4GB of RAM, making it suitable for demanding encrypted document storage and multi-user environments. Its hardware-level 4K decoding supports media streaming alongside data security, and its quiet operation at just 21dB makes it suitable for office settings. Compared with the Asustor Lockerstor 4, which emphasizes media playback and hybrid storage, the F4-425 is more geared toward raw processing power and flexible RAID support. The setup process, which relies on mobile apps, may challenge less tech-savvy users, and it requires purchasing drives separately. This device fits users who need both encryption and high-performance multitasking in a dedicated storage solution.
Pros:- Powerful quad-core processor with hardware 4K decoding
- Supports multiple RAID configurations for security and redundancy
- Quiet operation suitable for office environments
- Large storage capacity with support up to 120TB
Cons:- Requires setup via mobile app, which may be less intuitive
- No included drives, increasing initial investment
- Limited to 4GB RAM, which may constrain heavy multitasking
Best for: Power users or small offices requiring secure, high-performance encrypted storage with advanced media capabilities.
Not ideal for: Beginners or those seeking a plug-and-play experience without technical configuration or extra hardware investments.
- Processor:Intel x86 quad-core
- RAM:4GB
- Storage Capacity:up to 120TB
- Network:2.5GbE LAN
- Noise Level:21dB
- HDD Tray:Tool-free Push-Lock
Our verdict“This NAS is best suited for technically skilled users demanding high performance and encryption in a dedicated storage environment.”
UGREEN NAS DXP4800 Pro 4-Bay for IT Professionals, Developers & Power Users
The UGREEN NAS DXP4800 Pro distinguishes itself with enterprise-level hardware, including an Intel Core i3 processor and expansive DDR5 RAM, making it ideal for encrypted document storage in demanding professional environments. Its support for virtual machines, Docker, and AI, along with encrypted data vaults, offers unmatched security and flexibility compared to simpler consumer options like the Synology DS423. Its high-performance network ports, including 10GbE, cater to heavy encrypted data transfers and multi-user access. However, the complex setup process and large physical footprint mean it’s not suited for casual or less experienced users. This device is best for organizations or advanced users needing a secure, scalable, and multi-functional storage platform.
Pros:- High-performance Intel Core i3 processor with extensive RAM support
- Supports virtual machines, Docker, and AI features for advanced workflows
- Massive storage capacity with support for encryption and security
- Includes 10GbE connectivity for fast data transfers
Cons:- Setup and management require significant technical knowledge
- High hardware costs may be prohibitive for small-scale users
- Large physical size requires ample space and infrastructure
Best for: IT professionals and small enterprises with high security, scalability, and performance requirements for encrypted data.
Not ideal for: Home users or small offices with limited technical expertise or smaller storage needs.
- Processor:Intel Core i3-1315U
- Memory:8GB DDR5 (expandable to 96GB)
- Storage Capacity:144TB
- Network Ports:10GbE + 2.5GbE
- Supported RAID:0, 1, 5, 10
- Security:Data Vault encryption
Our verdict“This NAS excels for security-conscious organizations needing scalable, high-performance encrypted storage with enterprise features.”
Asustor Lockerstor 4 Gen2+ AS6704T v2 4-Bay NAS
The Asustor Lockerstor 4 Gen2+ combines high-speed dual 5GbE ports, hybrid storage support, and 4K media transcoding, making it a strong choice for encrypted document storage alongside media management. Its support for SATA and NVMe SSDs offers flexible, high-performance storage options, while HDMI output makes it suitable for media playback, contrasting with more storage-centric solutions like the Terramaster F4-425. Its expandable RAM up to 16GB enhances performance for heavy encryption tasks. However, it requires separate drives to be purchased, and its setup may be complex for users unfamiliar with NAS configurations. This device fits users who prioritize media use combined with secure, encrypted storage for documents.
Pros:- High-speed dual 5GbE network ports for fast encrypted transfers
- Supports hybrid storage with SATA and NVMe SSDs for performance and capacity
- HDMI output for 4K media playback
- Expandable RAM up to 16GB for better multitasking
Cons:- Requires purchasing drives separately, increasing initial cost
- Setup and configuration can be complex for beginners
- Price details are not specified, which may affect budgeting decisions
Best for: Content creators, small business owners, or media enthusiasts needing encrypted storage with media playback features.
Not ideal for: Users seeking simple, plug-and-play storage solutions without multimedia or high-configuration needs.
- Processor:Intel Celeron N5105
- Memory:4GB DDR4 (expandable to 16GB)
- Storage Bays:4
- Network Ports:2 x 5GbE
- Video Output:HDMI
- Maximum RAM:16 GB
Our verdict“This NAS is well-suited for users who want encrypted storage combined with media capabilities and flexible storage options.”
Synology DS425+ 4-Bay Diskless NAS Private Cloud Media Server
The Synology DS425+ stands out as the best overall option for small businesses seeking encrypted document storage, thanks to its robust data protection features like RAID and snapshots, combined with fast transfer speeds of 278 MB/s. Its support for up to 30 IP cameras adds security layers, making it suitable for businesses with surveillance needs. However, being diskless, it requires investment in drives, and its setup can be complex for those unfamiliar with Synology’s ecosystem. Compared with the QNAP TS-462A-4G, which offers hardware transcoding and easier drive maintenance, the DS425+ prioritizes data integrity and security over multimedia features. This makes it ideal for organizations emphasizing encrypted document safety above multimedia streaming or high flexibility.
Pros:- High-speed data transfer supporting large encrypted files
- Supports multi-layered data protection including RAID
- Strong surveillance integration for security monitoring
- Supports multiple concurrent users
Cons:- Requires purchasing and installing drives separately
- Setup can be complex for beginners
- Higher cost compared to entry-level NAS devices
Best for: Small business owners who need secure, scalable, and encrypted document storage with surveillance integration
Not ideal for: Home users or casual users seeking a plug-and-play solution without extensive setup or security features
- Number of Bays:4
- Type:Diskless NAS
- Data Transfer Speed:278 MB/s
- Supported Cameras:30 IP cameras
- Warranty:3 years
- Supported RAID:Multiple levels
Our verdict“This NAS is best suited for small businesses prioritizing security, scalability, and surveillance integration, despite its complexity and cost.”
QNAP TS-462A-4G 4-Bay Desktop NAS
The QNAP TS-462A-4G offers a compelling mix of high-capacity storage and multimedia capabilities, making it a strong choice for users who need both encrypted document storage and media streaming. Its hardware transcoding and dual 2.5GbE ports provide smooth video playback and fast network access, outperforming basic models like the Synology DS225+ in multimedia handling. However, its setup demands more technical knowledge, especially for configuring raid and network features, which might deter casual users. Compared to the Synology DS425+, it offers more flexibility in drive maintenance and higher network throughput but at a higher price point and with a steeper learning curve. This NAS is ideal for small teams or power users who want a versatile solution that combines encryption, multimedia, and expandability.
Pros:- Supports hardware transcoding for media streaming
- Fast dual 2.5GbE network ports for quick data access
- Hot-swappable drives for easy maintenance
- Flexible storage expansion options
Cons:- Requires technical knowledge for proper setup and management
- Higher price may be a barrier for budget-conscious users
- Limited RAM out of the box, upgrade needed for intensive tasks
Best for: Tech-savvy small business users or multimedia enthusiasts needing secure storage with high transfer speeds
Not ideal for: Users seeking a simple, plug-and-play NAS without advanced setup or management features
- Number of Bays:4
- Processor:Intel Quad-Core up to 2.9 GHz
- Memory:4 GB DDR4 (expandable)
- Network Ports:2 x 2.5GbE
- Storage Interface:SATA
- Special Features:Hardware transcoding, Qtier auto-tiering
Our verdict“This NAS is well-suited for users who need high-performance encrypted storage combined with multimedia capabilities and are comfortable with advanced setup procedures.”
Synology DS225+ Private Cloud Media Server – 2-Bay Diskless NAS with Intel CPU
The Synology DS225+ offers a balanced approach with its 2-bay design, making it a solid choice for encrypted document storage in small home or office environments. Its support for 4K media streaming and automated backups provides added versatility, especially when compared to the larger DS425+. However, its limited bays mean less scalability for growing storage needs, and since it is diskless, users must invest separately in drives. Its Intel CPU ensures reliable performance, but setup and network configuration may challenge less experienced users. Compared with the QNAP TS-462A-4G, it delivers less in raw capacity and multimedia flexibility but excels in simplicity and space efficiency. This model is perfect for individuals or small teams prioritizing encrypted storage with straightforward management.
Pros:- Supports 4K media streaming and private cloud setup
- Automated backup and RAID redundancy
- Intel CPU provides reliable performance
- Supports up to 30 IP cameras with AI detection
Cons:- Requires separate purchase of drives
- Limited scalability with only 2 bays
- Setup may be challenging for non-technical users
Best for: Home users or small offices needing secure, encrypted storage with media streaming and easy backups
Not ideal for: Growing businesses that require extensive storage or advanced surveillance features
- Storage Bays:2
- CPU:Intel
- Transfer Speed:282 MB/s
- Supports IP Cameras:Up to 30
- Warranty:3 years
- RAID Support:Yes
Our verdict“This NAS is best suited for small-scale encrypted storage and media needs, especially for users valuing simplicity and space-saving design.”
How We Picked
These products were evaluated based on a combination of encryption capabilities, hardware performance, user interface, build quality, and value. Priority was given to devices that offered hardware-based encryption acceleration, easy setup, and reliable data security features. We also considered the expandability options and how well each device handled multiple user access, especially in encrypted environments. The ranking reflects a balance between performance, ease of use, and overall security features tailored for encrypted document storage needs.| 4-bay NAS for encrypted document storage | Processor |
|---|---|
| Synology DS423 4-Bay Diskless | — |
| Synology 4-Bay DiskStation DS9 | — |
| TERRAMASTER F4-425 4-Bay NAS I | Intel x86 quad-core |
| UGREEN NAS DXP4800 Pro 4-Bay f | Intel Core i3-1315U |
| Asustor Lockerstor 4 Gen2+ AS6 | Intel Celeron N5105 |
| Synology DS425+ 4-Bay Diskless | — |
| QNAP TS-462A-4G 4-Bay Desktop | Intel Quad-Core up to 2.9 GHz |
| Synology DS225+ Private Cloud | — |
Factors to Consider When Choosing Best 4-bay NAS For Encrypted Document Storage
When selecting the best 4-bay NAS for encrypted document storage, it’s important to consider several key factors beyond just hardware specs. Encryption performance, user management, and security features can significantly impact how well your data remains protected and accessible. Additionally, ease of setup and ongoing maintenance play roles in long-term value. Understanding these aspects helps avoid common pitfalls like underestimating CPU requirements for encryption or choosing incompatible security protocols.Encryption Hardware and Performance
Opt for NAS devices with hardware-accelerated encryption, which can handle encryption tasks without sacrificing performance. This is especially important if you plan to access large files frequently or in multi-user environments. Devices with dedicated encryption engines, like those from Synology, often deliver faster, more reliable security without slowing down your workflow. Be cautious of models that rely solely on software encryption, as they can become bottlenecks during heavy use.
User Interface and Management
A user-friendly interface reduces setup time and ongoing management complexity. Synology’s DiskStation Manager, for example, is known for its intuitive layout and comprehensive security controls, making it easier to configure encrypted shares and manage user permissions. Advanced users might prefer more customizable options like QNAP’s QTS, but beginners should prioritize simplicity. Consider how much control you need versus how easy the setup process is for your comfort level.
Hardware Specs and Future-proofing
Look for a NAS with a capable CPU and sufficient RAM—ideally quad-core processors and at least 4GB of RAM—to handle encryption tasks smoothly. Higher specs also support future expansion, such as adding more users or running additional services. Keep in mind that more powerful hardware generally comes at a higher price, so balance your current needs with anticipated growth. Investing in better hardware now can prevent costly upgrades later.
Build Quality and Reliability
Durability and build quality matter, especially if the NAS will be in a 24/7 environment. Devices from reputable brands like Synology and QNAP tend to have better component quality and longer lifespans. Reliable hardware reduces the risk of data loss or downtime, which is critical when dealing with encrypted documents that require continuous protection. Consider also the availability of warranty and support services for peace of mind.
Security Ecosystem and Expandability
Beyond built-in encryption, look for features like VPN support, multi-factor authentication, and compatibility with third-party security tools. Some NAS units support additional security add-ons that strengthen encrypted storage. Also, evaluate whether the device allows for storage expansion or additional drives, which can be useful as your data needs grow. Expandability options help ensure your investment remains viable over time.
Frequently Asked Questions
How important is hardware encryption acceleration for my NAS?
Hardware encryption acceleration can significantly improve the performance of encrypted storage by offloading encryption tasks from the CPU. This means faster data transfer speeds and less strain on system resources, especially when handling large files or multiple users. For environments where security and speed are priorities, choosing a NAS with dedicated encryption hardware is advisable. Without it, encryption can slow down your workflow or lead to lag, particularly in busy or enterprise settings.
Can I upgrade the RAM or CPU later for better encryption performance?
Many 4-bay NAS devices support hardware upgrades, but this depends on the model. Upgrading RAM is generally straightforward and can improve multitasking and encryption performance. CPU upgrades are less common and often require replacing the entire unit. When encryption is a key concern, choosing a device with a more powerful CPU and upgrade options from the start can save you from future frustrations. Always check manufacturer specifications for upgradeability before purchasing.
What security features should I look for besides hardware encryption?
Beyond hardware encryption, consider features like VPN support, multi-factor authentication, and encrypted remote access. These tools help protect your data during transmission and access, adding layers of security to your encrypted storage. Compatibility with secure protocols like SSL/TLS and the ability to set granular user permissions also matter. A comprehensive security ecosystem minimizes vulnerabilities and keeps sensitive documents safe from unauthorized access.
Is a diskless NAS a good choice for encrypted document storage?
Yes, a diskless NAS offers flexibility because you can choose your own drives, which allows for better control over encryption and security settings. It also enables upgrading drives or replacing failed disks without replacing the entire unit. However, it requires more technical know-how during setup and configuration. For those comfortable with configuring their storage, diskless options provide a customizable and potentially more secure environment for encrypted documents.
How do I choose between a more affordable NAS and a premium model?
Affordable NAS devices may lack hardware encryption acceleration, advanced security features, or high-performance CPUs, which can impact encrypted document handling and overall speed. Premium models, like Synology’s higher-end offerings, typically include dedicated encryption hardware, better build quality, and more robust security options, justifying their higher cost if security and performance are priorities. Your choice should depend on your security needs, expected data volume, and willingness to invest in future-proofing your setup.
Conclusion
For most users prioritizing ease and security, the Synology DS925+ makes an excellent overall choice thanks to its balance of performance, security features, and user-friendly management. Those seeking the best value should consider the Terramaster F4-425, which offers solid hardware at a more accessible price point. If you are a beginner or need a straightforward setup, the Synology DS425+ is a reliable, simple option. Power users or enterprises with advanced requirements might prefer the QNAP TS-462A-4G for its expandability and robust security ecosystem. Your specific needs and technical comfort level should guide your final decision.
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