The Synology DiskStation DS925+ is a capable 4-bay NAS designed for home users and small businesses that need reliable, expandable network storage with fast connectivity and a polished software ecosystem. With 2.5GbE networking, M.2 NVMe SSD caching, and the ability to expand up to 9 bays, it sits in a competitive but well-defined space for buyers who want more than a basic NAS without the cost of enterprise-grade hardware.
Synology has built a strong reputation for its DiskStation Manager (DSM) operating system, and the DS925+ benefits from the same mature, feature-rich platform that powers its larger siblings. Whether you need centralised backup, local surveillance, collaborative file sharing, or a private cloud alternative, this unit covers a wide brief at a price point that remains reasonable for what it delivers. If you are also reviewing your wider network infrastructure, our guide to the Best NAS for Small Business is worth reading alongside this review.
⭐ Quick Verdict
The Synology DS925+ is an excellent mid-range NAS that punches above its weight thanks to a well-optimised processor, dual M.2 NVMe slots for tiered caching, and 2.5GbE connectivity that keeps throughput competitive on modern home and office networks. DSM remains one of the best NAS operating systems available, making setup and ongoing management genuinely straightforward even for non-technical users. The expandability to 9 bays via a DX525 expansion unit gives it meaningful room to grow, and the inclusion of surveillance and collaboration tools within DSM adds value without additional licence costs for many use cases. It is not perfect: diskless pricing means you need to factor in drive costs, and power users who require 10GbE or a PCIe expansion slot will hit a ceiling. Overall, however, the DS925+ is a strong, well-rounded choice for anyone wanting a serious home or SMB storage solution backed by a reliable software ecosystem.
? Key Specifications
| Component | Details |
|---|---|
| Drive Bays | 4 x 3.5″/2.5″ SATA (expandable to 9 bays with DX525) |
| M.2 NVMe Slots | 2 x M.2 2280 NVMe SSD (cache only) |
| Processor | AMD Ryzen R1600 dual-core 2.6 GHz (burst 3.1 GHz) |
| RAM | 4 GB DDR4 ECC (expandable to 32 GB) |
| Network Ports | 2 x 2.5GbE RJ-45 |
| USB Ports | 2 x USB 3.2 Gen 1 |
| eSATA | 1 x eSATA (for expansion unit) |
| Operating System | Synology DSM 7.x |
| RAID Support | SHR, JBOD, RAID 0, 1, 5, 6, 10, SHR-2 |
| File Systems | Btrfs, EXT4 |
| Power Consumption | Approx. 28W (HDD hibernation: approx. 8W) |
| Dimensions | 166 mm x 199 mm x 223 mm |
| Weight (diskless) | Approx. 2.24 kg |
| Fan | 1 x 92 mm system fan |
? Pros
- 2.5GbE dual ports provide noticeably faster throughput than legacy 1GbE units, with link aggregation support for even greater bandwidth
- M.2 NVMe SSD caching accelerates read and write performance without consuming any of the four main drive bays
- Expandable to 9 bays via the Synology DX525, offering genuine storage growth headroom for growing businesses or collections
- DSM software ecosystem is mature, intuitive, and packed with first-party apps covering backup, surveillance, collaboration, and virtualisation
- ECC RAM support (with compatible RAM upgrades) provides data integrity protection that is rare at this price tier
- Low power consumption makes it suitable for always-on deployment in a home or small office environment without a significant electricity overhead
? Cons
- Sold diskless, so the true cost of ownership requires adding compatible hard drives, which can significantly increase the total outlay
- No 10GbE or PCIe expansion slot, which limits future-proofing for users in environments where very high throughput is essential
- M.2 slots are cache-only and cannot be used as primary storage volumes, which may frustrate buyers expecting full SSD-only pools
- Four bays is limited for heavier workloads until the DX525 expansion unit is added, which carries an additional cost
? Best For
✔ Small businesses needing a centralised, managed file storage and backup solution
✔ Home users who want a private cloud with collaboration tools and remote access
✔ CCTV and surveillance setups using Synology Surveillance Station
✔ IT administrators who want expandable storage with a polished management interface
✔ Users running multiple services (backup, media, sync) from a single always-on device
✔ Those replacing an ageing NAS and wanting to benefit from 2.5GbE without a full infrastructure overhaul
Performance and Real-World Use
The AMD Ryzen R1600 processor at the heart of the DS925+ is a meaningful step up from the ARM-based chips found in budget NAS units. It handles simultaneous workloads comfortably, including transcoding via Plex (with a Plex Pass), running Docker containers, and processing backup jobs at the same time. Sequential read speeds over 2.5GbE with a compatible switch can approach the theoretical limits of the connection, and NVMe caching noticeably improves random I/O for frequently accessed data. If you pair this unit with a compatible 2.5GbE switch or router, the difference compared to a standard gigabit NAS is immediately apparent during large file transfers. For small business environments, pairing the DS925+ with a well-configured router such as those covered in our DrayTek Vigor 2865 review creates a robust and reliable local network stack.
DSM 7 continues to be one of the strongest arguments for choosing Synology over competitors. The interface is clean and logical, package installation is straightforward, and features like Hyper Backup, Active Backup for Business, Synology Drive, and Surveillance Station are available without recurring licence fees for typical home or small business deployments. Security is handled thoughtfully within DSM, with two-factor authentication support, firewall rules, and automatic security advisory alerts. Given the sensitive nature of centralised storage, pairing strong NAS access controls with a hardware security key such as a Yubico Security Key is a sensible step for any business deployment.
Storage Configuration and RAID Options
The DS925+ supports Synology Hybrid RAID (SHR), which intelligently manages mixed drive sizes and is ideal for home users adding drives incrementally. For business deployments, traditional RAID 5 or RAID 6 configurations are supported, with RAID 6 offering dual-drive fault tolerance across four bays. Btrfs file system support enables snapshot-based data protection, allowing near-instant recovery from accidental deletion or ransomware-related corruption without restoring from a full backup. For a deeper look at setting up RAID correctly on a NAS, our step-by-step RAID setup guide covers the process in detail. The expandability to 9 bays via the DX525 unit is achieved through the rear eSATA port and is fully managed within DSM, making the expansion process relatively seamless when the time comes.
Surveillance and Collaboration
Synology Surveillance Station is included with DSM and supports up to two IP cameras on a free licence, with additional licences purchasable per camera. For small offices or home use, this is a genuinely useful addition that removes the need for a separate NVR. Motion detection, alert notifications, and timeline playback are all handled within the DSM interface. On the collaboration side, Synology Office and Synology Drive provide a self-hosted alternative to cloud productivity suites, with document editing, team folders, and version control available to all connected users on the local network or via QuickConnect remotely.
Who Should Consider This NAS?
The DS925+ occupies a sensible position between the entry-level DS423+ and more expensive units like the DS1522+. It is particularly well suited to IT-aware home users and small businesses with between 5 and 20 users who need a managed file server, off-site backup target, or centralised media library. If you are currently assessing whether a NAS is the right fit compared to a full server, our NAS vs Server comparison guide lays out the key considerations clearly. Those who anticipate needing more than 9 bays or require 10GbE connectivity from day one would be better served looking at Synology’s rack-mount range, but for the majority of home and SMB buyers, the DS925+ covers the ground very well.
Buy the Synology DiskStation DS925+
The Synology DiskStation DS925+ is a 4-bay NAS powered by an AMD Ryzen R1600 processor, featuring dual 2.5GbE ports, two M.2 NVMe SSD cache slots, and expandability to 9 bays via a DX525 unit. Running Synology DSM 7, it delivers a comprehensive platform covering backup, surveillance, collaboration, and private cloud storage for home users and small businesses alike.
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? Related Guides
- Best NAS for Small Business (2025 Buyer’s Guide)
- What is a NAS: Network Attached Storage Guide
- How to Set Up RAID on a NAS: Step-by-Step Guide
- NAS vs Server: Help Me Choose Which Is Best
- Your Best Defence Against Ransomware: Backup Best Practices
❓ Frequently Asked Questions
Can the Synology DS925+ be used as a Plex media server?
Yes. The AMD Ryzen R1600 processor in the DS925+ is capable of handling Plex media server duties, including hardware-accelerated transcoding for multiple streams when a Plex Pass subscription is active. Performance will depend on the resolution and codec of your media files, but for most home users streaming 1080p or lower quality content, the DS925+ handles this workload comfortably alongside other running services.
What hard drives are compatible with the DS925+?
Synology publishes a compatibility list on its website covering tested and approved drives. Generally, Synology IronWolf, Seagate IronWolf, and WD Red Plus or WD Red Pro drives are widely used and compatible. It is strongly recommended to consult the official Synology Compatibility List before purchasing drives to ensure full DSM integration, including health monitoring via S.M.A.R.T. and drive lifespan estimation.
How many cameras can Surveillance Station support on the DS925+?
Surveillance Station is included with DSM and comes with two free IP camera licences. Additional cameras require per-camera licences purchased separately through Synology. The number of cameras the DS925+ can practically support also depends on the resolution, frame rate, and recording mode selected for each camera, as higher quality streams consume more CPU and storage resources.
Can I expand the DS925+ beyond 4 bays?
Yes. The DS925+ can be expanded to a total of 9 bays by connecting a Synology DX525 5-bay expansion unit via the rear eSATA port. The expansion unit is managed directly within DSM and the additional bays appear as part of the same storage pool, making the process transparent and straightforward. This makes the DS925+ a sensible long-term investment even if you start with only a few drives installed.
Does the DS925+ support Docker and virtual machines?
Docker is supported on the DS925+ via Synology’s Container Manager package, allowing users to run a wide variety of self-hosted applications in isolated containers. Virtual Machine Manager is also available for DSM, though running full virtual machines is resource-intensive and works best when RAM has been upgraded beyond the base 4 GB configuration. For typical Docker use cases such as running a home assistant, Pi-hole, or other lightweight services, the DS925+ performs well without modification.
Related Posts
- NAS vs Server – Help Me Choose Which Is Best
- What Is a NAS – Network Attached Storage Guide
- Best NAS for Small Business (2025 Buyer’s Guide)
- How to Set Up RAID on a NAS (Step-by-Step Guide for 2025)
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