Synology DS425+ in hand: keeps core hardware stable, accelerates network access, compatible with many HDDs

Synology DS425+ is a compact 4-bay NAS, strong in DSM software and security, now more flexible when DSM 7.3 allows the use of third-party hard drives on the Plus line.

For many years, when it comes to Synology NAS lines, especially the Plus group, hard drive compatibility issues often stop at recommendations: Synology prioritizes drives that have been tested by the company to ensure stability and long-term support, but users still have quite a few third-party options. Only with the 25 series generation was this policy tightened, making many users wonder about the level of flexibility when upgrading or taking advantage of existing hard drives.

However, that landscape has changed significantly when Synology deployed DSM 7.3 for the 25 series, including Plus, Value and J. In this version, the company adjusted its approach to be more open: the system still clearly warns about the level of compatibility and support, but there is no longer a hard limit on the use of third-party hard drives like before. The actual experience becomes more flexible, especially for home users and small offices - the main customer group of DS425+.

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Design & hardware

Synology DS425+ still retains the familiar style of the Plus series: square body, hard plastic shell, minimalist black tone, suitable for both office and home spaces.

The front panel includes four hard drive trays that support hot-swap, sturdy structure, and removal without tools.

The front part does not have many unnecessary details, only a row of status lights and a power button, while the back part is the location of two 92 mm cooling fans that operate quite quietly, even when the system runs at high load for many hours. DS425+ is aimed at users who need a neat, stable and powerful NAS to run multitasking storage and background services. Inside, DS425+ uses a 4-core Intel Celeron J4125 CPU, 2GB DDR4 RAM that can be upgraded, supporting a maximum of 6GB. This CPU is not as powerful as mini-PCs but is optimized for NAS tasks: basic video decoding, power optimization, running multiple storage services simultaneously, handling large backups and running the DSM operating system smoothly.

The device supports 4 3.5" or 2.5" hard drives, total capacity depends on user configuration. Although there is no NVMe slot for cache like high-end models, DS425+ still maintains quite good mechanical drive performance for multi-purpose needs at home or small workgroups. In fact, with RAID 5 and 7200RPM hard drive, gigabit LAN read/write speed always reaches the maximum limit of the connection.

Quick setup & initial configuration

The obvious point when starting to use a Synology NAS is that the setup process is very neat. After attaching the hard drive, connecting LAN and applying power, users only need to visit find.synology.com to initialize DSM. Although this is a familiar operation for those who have used NAS, DS425+ still brings a sense of simplicity: step-by-step instructions interface, selecting RAID type, automatically checking firmware and activating the administrator account.

There was an interesting situation during use: when I transferred a single hard drive from a DS1621+ system running DSM 7.2.1 to a DS425+ with DSM 7.3, the system did not require the Data Migration step as usual. Because it only uses an independent hard drive, without RAID configuration, the conversion process is essentially simply moving data and settings from one NAS environment to another hardware platform, instead of a complex system upgrade or consolidation process. During setup, the system offers a basic security package, including automatic HTTPS activation, strange login warnings, and vulnerability scanning. This helps DS425+ to be configured in a minimally secure way, right from the first use, limiting the risk of opening unnecessary ports or using weak passwords.

DSM 7.3: The heart of the entire experience

DSM 7.3 is the biggest strength that makes DS425+ different from many other NAS, including DIY systems using Linux. The interface is compact and friendly, does not require users to understand too deeply about the system while still managing all data and services. When accessing DSM via browser, all operations from installing apps, assigning folder permissions, monitoring resources or checking hard drives are clearly presented in a virtual desktop format, similar to Windows or macOS.

The Package Center store provides a full range of applications to serve your storage, backup, sharing, multimedia and background service needs. Familiar tasks such as creating Shared Folders, setting read/write permissions, monitoring capacity or warning about being full all require just a few mouse clicks. Under continuous operating conditions, DSM runs stably, and when updating the operating system or security module, the update process takes place quickly and does not greatly affect the service being used. For important security updates, you should let the system update at times when NAS access is low, such as midnight or early morning.

Multitasking, storing & sharing data

The strength of DS425+ lies in its ability to operate multiple storage tasks in parallel. File Station acts as a central file manager, allowing you to access, copy, share and view documents directly on the web interface. When transferring large files from the computer to the NAS using gigabit LAN, the speed is always stable, with little fluctuation, even when the system is running additional Time Machine backup tasks, synchronizing mobile devices or transferring files between internal folders.

DS425+ supports SMB, AFP, NFS, FTP, WebDAV... so it is almost compatible with all operating systems. For small workgroups, using a NAS as a common project folder helps reduce file sending time, makes version management easier, and limits data loss due to scattered storage on multiple USB drives. In addition, the quick link sharing mechanism via Synology Drive helps send documents to partners without using external cloud services.

Synology Drive & cross-platform sync

Drive is the service that makes DS425+ truly a "personal cloud". On computers, Drive Client works similarly to OneDrive or Google Drive: creating sync folders for both backup and cross-access between multiple devices.

Thanks to the versioning mechanism, all changes are saved, reducing the risk of accidentally editing or deleting important files. For workgroups, sharing a common Drive folder helps synchronize documents quickly, reduces duplicate drafts and helps keep track of edit history clearly.

On the phone, the Synology Photos application integrates Drive to automatically back up photos and videos, sorting by date, face, and location. With the DS425+ running stably, background image backup happens automatically, without affecting the machine's usage.

Backup: Automated & more secure than public cloud

NAS was born to protect data, and DS425+ plays this role well through Hyper Backup, Active Backup and snapshots. Hyper Backup allows backing up entire systems, folders, applications to an external drive, another NAS or cloud service. Active Backup specifically supports backing up Windows computers, file servers or virtual servers, suitable for small offices that need a centralized backup system.

Snapshot Replication is the third layer of protection, creating an instant snapshot of a folder or volume. If malicious code accidentally encrypts files or mistakenly deletes data, snapshots help recover within seconds. With solid speeds and flexible scheduling capabilities, DS425+ feels more reliable than relying solely on the public cloud, which has limited capacity and does not allow for deep configuration.

Scalability across applications & services

In addition to storage duties, DS425+ can take on many more roles thanks to the application ecosystem: serving as a camera server, running Docker, simple web hosting, download management or video storage. Although the CPU is not too powerful to run many complex containers, light tasks such as internal web, installing a few small services or running Plex at 4K level are still fine. The NAS also supports streaming video via DLNA or Plex, and with an Intel CPU capable of basic transcoding, watching videos over the local network is smooth.

Proactive security & long-term operations

In a context where personal and business data are increasingly vulnerable to attacks, DS425+ integrates many layers of security: firewall, login protection, anomaly notifications, 2FA support and automatic vulnerability scanning. DSM also recommends safe configuration from the beginning such as turning off default admin, restricting access outside the network or using QuickConnect instead of opening port 445/5003 directly. In actual use, the NAS operates stably 24/7, has low temperatures, reasonable power consumption and quiet fans. When capacity increases, users only need to add drives or expand RAID, without having to rebuild from scratch like with removable storage solutions. This is what makes DS425+ suitable for both families and long-term work groups.

Conclusion

Synology DS425+ is a 4-bay NAS suitable for advanced home users, small offices, or creative teams that need a centralized, secure, and easy-to-manage storage system. The core strengths of the product still lie in the stable DSM ecosystem, comprehensive synchronization - backup capabilities and proactive security layers, helping data to be well protected during long-term operation.

Regarding hardware, DS425+ does not run at too high a configuration, but is reasonably designed for the right group of needs. The machine has two M.2 NVMe slots to expand the SSD cache, helping to improve responsiveness when accessing data frequently, although these slots are not used to create independent storage partitions. At the same time, the DS425+ does not support capacity expansion via external devices like the DX525, so the storage configuration will be contained in four main hard drive bays.

One positive point is that with DSM 7.3 on the 25 series Plus, Value or J, third-party hard drive compatibility has become more flexible. Users can continue to use drives from Seagate, WD or Toshiba with clear warnings about the level of support, instead of being hard limited like in the initial launch phase. This makes DS425+ more practical and "accessible", especially for those who already have a hard drive or want to optimize initial investment costs. If you are approaching Synology for the first time, using their hard drive will have many advantages in terms of firmware updates, quick technical support or easier after-sales service. Overall, DS425+ is a balanced choice between performance, stability and software experience. This is a NAS model suitable for users who prioritize simplicity, reliability, good compatibility and a storage system that can operate durably for many years without requiring complex hardware expansion. Those interested in the product can see more here.