The ultimate NAS system evaluation in 2025: From finished product to DIY, a complete guide to private cloud selection

mobile phones, computers, the longer you use it, the more data you need to save, photos, movies, documents, games, many important data need to be backed up The speed limit of the public cloud, privacy the risk of leakage is becoming increasingly prominent, NAS (network attached storage) as a private cloud solution, has become a home user, A must-have tool for professional creators and businesses. In 2025, the NAS market will show a trend of "ecological maturity, civilian performance, and intelligent functions", not only finished product brands such as Synology and QNAP will continue to make efforts, but also DIY assembly with free NAS system solutions will also become a popular choice for technology enthusiasts with their high cost performance and high degree of freedom. This article will conduct a comprehensive evaluation from the two dimensions of finished system and DIY free system, covering all scenarios of family, professional, and enterprise, to help you accurately match your needs.

1. Explanation of the core dimensions of evaluation

This evaluation takes into account both the "integrated experience of finished software and hardware" and the "DIY free customization solution", and examines four dimensions:

1. system ease of use : interface design, entry threshold, operation smoothness, DIY system additional inspection of installation complexity;
2. core functions : backup synchronization, file management, audio and video processing, and ecological support (such as Docker, virtual machines);
3. performance : data transmission speed, multitasking stability, hardware resource occupation and adaptability;
4. scalability and compatibility : Hardware expansion capabilities, multi-device adaptation, and cross-platform synchronization support, with DIY systems focusing on evaluating hardware compatibility ranges.

evaluation targets include mainstream finished NAS systems (Synology DSM, QNAP QTS, Greenlink UGOS Pro, Extreme Space ZOS) and popular free DIY NAS systems (TrueNAS Scale/Core, OpenMediaVault, Feiniu FnOS), catering to the needs of both entry-level users and high-end gamers.

2. In-depth analysis of mainstream finished NAS systems

(1) Synology DSM System: The Ecological King of "Stability"

Synology's DiskStation Manager (DSM) system is the "iOS" of NAS world, known for its stability and ecological integrity, and is the first choice for professional users when paired with popular models such as DS925+.

Core Strengths:

• Ease of use: The interface is simple and intuitive, and the backup process is highly automated, so even novices can get started quickly without complex configuration.

• ecosystem is powerful: Synology Photos' photo management capabilities are the benchmark in the industry, supporting intelligent classification and lossless backup, which perfectly adapts to the needs of photographers. Native applications such as Drive and Active Backup cover file synchronization and cross-device backup, and enterprise-level functions such as team sharing and permission management are all available.

• Outstanding

  stability: Low long-term operation failure rate, complete data protection mechanism, support for multiple RAID modes, and snapshot function to effectively avoid data loss.

shortcomings and limitations:

• Low cost performance: the price under the same configuration is significantly higher than that of domestic models and DIY solutions, and the hardware cost higher;

• Strong system closure: Although stability is guaranteed, the playability is insufficient, and the customization needs of advanced players are limited.

Suitable for: Home users, professional photographers/designers, and small businesses seeking peace of mind and stability, suitable for scenarios that require reliable data backup and team collaboration.

(2) QNAP QTS System: A Toss Paradise for "Hardcore Players"

QN's QTS system is labeled as "high degree of freedom and strong expandability", and with models such as the QUI-405, it has become the preferred choice for hardware gamers and technology enthusiasts.

Core Strengths :

• highly playable: fully supports Docker container and virtual machine deployment, comes with high-speed VPN function, and can expand rich functions through plug-ins to meet the personalized needs of high-end users;

• Flexible hardware expansion: supports PCIe card upgrade LAN ports (up to 25G rate), and some models are equipped with M.2 NVMe slots for flexible storage and transfer performance.

• Multi-scenario adaptation: Taking into account both home audio and video and enterprise office, it supports ARM NEON video hardware transcoding, and can be used to build various applications such as media centers and servers with Docker.

shortcomings and limitations:

• high entry threshold: the system functions are complicated, the interface logic is not as intuitive as Synology, and novices need to have a certain learning cost;

• Frequent system updates: Feature stacking leads to slightly inferior stability in some scenarios, and redundant functions may increase operational complexity.

suitable for : technical players who like to toss around, users who need to deploy Docker and virtual machines, small businesses with high requirements for scalability, suitable for scenarios that pursue "one machine for multiple purposes".

(3) Greenlink UGOS Pro System: "Appearance and Cost-effectiveness" for home use

Greenlink has risen rapidly in the past two years with the UGOS Pro system, with "simple to use, cost-effective hardware" as its selling point, with DXP4800, DH4300 Plus and other models to accurately hit the needs of home users.

Core Strengths:

• Beginner-friendly: The interface is clean and simple, ready to use out of the box, NFC one-touch connection function simplifies the first configuration process, and detailed function descriptions and nanny-style tutorials are provided in the system;

• AI Smart blessing: Support local AI face recognition, intelligent photo album classification, automatic deduplication function adapted to Apple devices, photo backup is efficient and worry-free;

• Cost-effective: solid hardware configuration, entry-level models can be started for less than 1,000 yuan, and high-end models are lower than international brands with the same performance;

• Excellent AV Experience: Equipped with an HDMI port that supports 4K HDR output, compatible with various video formats, making it easy to create a home audio center.

shortcomings and limitations:

• ecosystem is still growing: the richness of the software ecosystem is not as good as that of Synology and QNAP, and some professional functions (such as enterprise-level permission management) support are limited;

• compatibility needs to be improved: third-party application adaptation is not as comprehensive as that of established brands, and high-end gameplay needs to wait for subsequent system optimization.

Suitable for: Home audio-visual parties, photography enthusiasts, and novice NAS users, suitable for home storage scenarios that pursue cost-effective, plug-and-play use.

(four) pole space ZOS system: an all-rounder with "full performance"

Space ZOS system is paired with models such as the Z4Pro + Performance Edition to take into account both home entertainment and light office needs, becoming the backbone of domestic NAS.

Core Strengths:

• Strong performance: The flagship model is equipped with an Intel i3-N305 processor (8 cores and 8 threads), 16GB DDR5 memory, fast file transfer and video transcoding speed, and smooth multitasking;

• clear operation logic: the UI design is beautiful, and the local album, video, and backup functions are integrated, so there is no need to switch between multiple applications, and the user experience is coherent.

• device adaptation: The new Apple device is optimized in place, supports multiple devices to access at the same time, and the family sharing function is convenient, suitable for multi-member use.

shortcomings and limitations :

• Weak enterprise-level ecology: insufficient brand precipitation, limited support for enterprise-level functions (such as dual power supply and large-scale redundancy), making it difficult to meet the needs of large enterprises;

• Lack of deep gameplay: Although high-end features such as Docker support are launched, they are not as optimized as QNAP, and professional users may find the playability insufficient.

Suitable for : High-performance home players, users who need to take care of both audio-visual and backup, novices who pursue one-step approach, suitable for families and small studios with performance requirements.

3. In-depth analysis of popular free DIY NAS systems

For users who pursue high cost performance and like customization, DIY assembly hardware with a free NAS system solution can not only flexibly choose the configuration, but also save costs.

(1) TrueNAS Scale/Core: The Open Source Benchmark for "Enterprise Performance"

TrueNAS is divided into Linux-based Scale version and FreeBSD-based Core version, which is a representative of enterprise-level features in open source NAS systems.