Synology DiskStation DS425+ 4-Bay Diskless NAS | Intel Celeron J4125 Quad-Core | 2GB DDR4 | 1x 2.5GbE LAN | 2x M.2 NVMe SSD Slots


Extra speed when you need it
What's different?
Synology DS425+ is a solid 4-bay NAS that's perfect for home offices, small businesses and content creators who need reliable storage without the complexity of enterprise systems. The standout feature is its 2.5GbE networking
which delivers noticeably faster file transfers and backups compared to the previous generation of 1GbE models.
Pair DS425+ with a Synology router (RT6600ax or WRX560) to maximize the 2.5GbE connectivity. Enjoy high-speed transfers and secure your network with VLANs, threat prevention and web filtering — all through a Synology interface that you can securely access and manage from anywhere.
When SSD cache makes perfect sense
Utilize M.2 NVMe SSDs to create an SSD cache when your workload involves frequent access to small, random files or repeated read/write operations.
- Deploying multiple containers
- Scrolling through large photo collections
- Running a file server with relatively small files accessed concurrently
When you need more speed
Utilize SATA 2.5" SSDs for primary storage when you need hot-swappable capability in situations where uptime is essential, such as database storage.
- Enable remote access to your files or keep everything local and offline
- Improve efficiency by adding SNV3000 or SNV5000 series M.2 SSDs without sacrificing a drive bay
- Back up all of your data with built-in tools, including PC, Mac, mobile devices and cloud data
- Deploy a hybrid cloud to scale storage capacity seamlessly via Synology C2 cloud
- Synchronize files across locations and devices automatically
Synology's end-to-end surveillance systems allow you to protect your home or business while keeping your data private

Unified monitoring made easy
Manage every detail of your surveillance system with precision using Surveillance Station, a centralized platform built for scalable, smart monitoring.
Multi-camera live view adapts to your needs with customizable layouts. Intelligent scheduling lets you fine-tune recording quality, motion triggers and alerts with ease.

Cameras made by Synology
Synology IP cameras feature built-in edge AI for accurate detection with local processing. Without sending footage to the cloud, Synology Cameras feature AI detection for people, vehicles and intrusions, all processed locally to enhance efficiency and cut down on false alerts. Choose wireless for easy setup or PoE for stable power and connectivity. All models are built for reliable outdoor use. No Surveillance Station license needed.

Compatible with a wide range of devices
Surveillance Station supports and integrates over 8,800 IP cameras from 180 renowned brands. This lets you connect your existing IP cameras and peripherals, such as access controllers and speakers, without needing to replace them.

Private cloud security
Secure your surveillance system with military-grade encryption that protects footage from hackers and unauthorized access attempts.
Built-in VPN server enables secure remote monitoring without exposing your network to external threats or vulnerabilities. Zero-trust architecture ensures only authorized users access specific cameras and recordings through verified authentication protocols.

Synology hard drives offer proven reliability and compatibility, achieved through a comprehensive testing regimen on Synology devices, spanning over 1,000 stress test cycles and 500,000+ hours.

What can I do with Synology?
- Back up PCs, Macs and mobile devices
- Stream photos, videos and music
- Access and share files securely
- Replace cloud services such as Dropbox
- Run Docker and virtual machines
- Collaborate on files in real-time
- Synchronize files and folders between Synology NAS devices
- Use immutable snapshots to create permenant, point-in-time system backups
Dedicated to security and data protection
Network Attached Storage (NAS) provides a centralized location on a network to store data. Synology NAS goes beyond that, enabling you to build your own private cloud eliminating vulnerabilities associated with the internet or public cloud.
Our Product Security Incident Response Team (PSIRT) provides 24-hour response to vulnerabilities, ensuring rapid patches when threats emerge. We employ top security researchers through our Bug Bounty Program and lead community events such as Pwn2Own.
- Encrypt files, folders and volumes with to keep personal data inaccessible, even if the NAS is stolen
- Create firewall rules, automatically block IP addresses with too many failed login attempts
- Enable 2FA or choose from a range of passwordless login methods such as USB logins, Windows Hello or Apple Touch ID
- Enable NAS-to-NAS backups from your primary NAS to an off-site Synology NAS on a schedule with Synology Hyper Backup
- Complete the 3-2-1 backup strategy with C2 Storage for Hyper Backup to ensure your data is accessible in any case
| Processor Specifications | |
|---|---|
| Processor Family | Intel Celeron J4125 |
| Processor Speed | Quad Core up to 1.7GHz |
| Memory | |
| RAM Capacity | 2GB |
| Memory Type | DDR4 |
| Storage | |
| Storage Capacity | Maximum Single Volume Size 108TB |
| Storage Type | 3.5" SATA HDD 2.5" SATA SSD M.2 2280 NVMe SSD |
| Drive bays | 4 2 (NVMe) |
| Storage Controller | |
| RAID Level | Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10 |
| Inputs & Outputs | |
| Ports | RJ-45 2.5GbE LAN Port RJ-45 1GbE LAN Port USB 3.2 Gen 1 Port x 2 |
| General Information | |
| Warranty | 2 Year |
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