Synology DS425+ Review Australia

Review Score

Review Score · Synology DS425+ · 7.0/10 Very Good

Performance 20% 5/10

Aging Celeron J4125 handles basics but struggles with 4K transcoding and heavy multi-threaded workloads.

Value 25% 6/10

Good value at Scorptec's $899 price but poor value near $999 where the DS925+ competes directly.

Software & Features 25% 9/10

DSM is the gold standard for NAS OS with excellent apps, Docker support, and regular updates.

Build & Hardware 15% 6/10

Compact 4-bay with M.2 slots and hot-swap, but only 2GB RAM stock and no expansion unit support.

Ease of Use 15% 9/10

DSM setup is intuitive and beginner-friendly; day-to-day management requires minimal technical knowledge.

How we score  ·  Need to Know IT Editorial Standard v1.0  ·  Scored: March 2026

Final Verdict

The Synology (one of the leading NAS brands) DS425+ is the 4-bay NAS (network-attached storage device) for Australian buyers who want the ease of use of DSM (Synology's operating system) and do not need the DS925+'s additional power and expandability. It handles home backup, file sharing, Synology Drive, light Docker (software that runs applications in isolated containers), and basic media serving well. The 2.5GbE port is a welcome upgrade, and power consumption is excellent for a 24/7 appliance.

Scorptec listed it at $899 when checked on 16 September 2026; confirm the live price before purchase. Not from PLE at $999 where the DS925+ offers dramatically more for the same money. Pair it with quality NAS drives, such as the Seagate IronWolf or WD Red Plus. Seagate (a major hard-drive brand) makes the IronWolf (Seagate's NAS-drive line), and Western Digital makes the WD Red (Western Digital's NAS-drive line); both are proven choices. Set up a proper backup strategy, and it will serve reliably for years. If you are a first-time NAS buyer, the Synology setup guide walks through the entire process from unboxing to production.

If you are buying a NAS for the first time, buy from a specialist like Scorptec or PLE where you can get genuine pre-sales guidance. Amazon support and warranty handling depend on whether the NAS is sold or fulfilled by Amazon or by a marketplace seller; verify the seller, return process and Australian warranty path before buying.

The Synology DS425+ is the mid-range 4-bay NAS for Australian buyers who want Synology's software ecosystem without paying for the DS925+'s AMD Ryzen hardware. When checked on 16 September 2026, Australian listings started at $813 and Scorptec listed the DS425+ at $899; confirm current pricing before purchase. Swapping one of the dual 1GbE ports for a 2.5GbE connection. Compared with the DS423+, the DS425+ retains the Intel Celeron J4125, 2GB of expandable DDR4 memory and the same compact chassis. The DS425+ suits home users, prosumers, and small office deployments where DSM's ease of use matters more than raw processing power.

AU Pricing and Where to Buy

The DS425+ is available from several major Australian NAS retailers. Here is what the retailer data shows as of September 2026:

The checked prices for these three retailers ranged from $899 to $999 on 16 September 2026; retailer prices can change independently. Mwave was $977.55 in the 16 September price comparison; confirm live pricing before purchase, while PLE's $999 brings it uncomfortably close to DS925+ territory at $995. At that price point, the DS925+ is the objectively better buy.

For context, the older DS423 (the value-tier 4-bay) is still available at $629 from Scorptec and $699 from Mwave. It uses a less powerful Realtek RTD1619B ARM processor with no M.2 NVMe (a fast type of storage chip used for caching) slots and dual 1GbE networking, but it does support Container Manager and Btrfs (a filesystem with built-in data-integrity checks). If your needs are modest. Basic file storage, backup, and perhaps one or two lightweight containers. The DS423 saves you $180-264 depending on where you buy. See our best 4-bay NAS Australia guide for the full comparison.

Synology DS425+. Full Specifications

The spec sheet tells a clear story: this is a platform refresh, not a generational leap. The Intel Celeron J4125 is the same quad-core processor used in the DS423+ and DS420+ before it. A chip from 2019/2020 that Synology has been using across its value and mid-range Plus models for years. The DS425+ supports file serving, Synology Drive, Hyper Backup and Container Manager, but performance when these services run together depends on workload, memory, storage and network configuration. Where it starts to struggle is with multiple simultaneous workloads, hardware transcoding of 4K content, and anything that demands sustained multi-threaded performance.

What Changed from the DS423

The DS425+ succeeds the DS423+ in Synology's Plus Series; the DS423 is a separate Value Series model. The changes are modest but meaningful:

The headline upgrade is the 2.5GbE port replacing one of the dual 1GbE ports. For anyone with a 2.5GbE switch or router. A single 2.5GbE link has 2.5 times the nominal line rate of a single 1GbE link, but real model-to-model throughput depends on port use, protocol, drives and configuration. If you are regularly moving video files, photo libraries, or large backups across your local network, the difference is immediately noticeable.

The CPU upgrade from the Realtek RTD1619B to the Intel Celeron J4125 is the more significant change under the hood. While the DS423 does support Container Manager and Btrfs on its ARM-based Realtek chip, the x86 Intel platform in the DS425+ offers broader container-image compatibility, but although the J4125 includes Intel Quick Sync hardware, the stock DSM configuration lacks the required graphics-driver support for hardware transcoding. Some Docker containers are only built for x86 architecture, so the DS425+ opens up a wider library of self-hosted applications. The two M.2 NVMe cache slots are also new. Absent from the DS423 entirely. Allowing SSD (solid-state drive) read/write caching for faster random I/O, useful for database workloads and virtual machines. The RAM upgrade path is another differentiator: the DS423's 2GB is soldered and not upgradeable, while the DS425+ can reach 6GB with an additional SODIMM.

Performance and Real-World Use

File Transfer and Network Performance

Synology reports up to 278 MB/s sequential read and 281 MB/s sequential write under its test conditions; actual performance varies with drives, RAID (combining multiple drives for redundancy or speed), protocol, client and configuration. Near the theoretical maximum of the 2.5GbE link. This is a substantial improvement over the DS423's 1GbE connection, which capped out around 112 MB/s. For households with multiple users accessing the NAS simultaneously, or anyone regularly transferring large files, the 2.5GbE port justifies the price premium alone.

The 1GbE port remains available for a secondary connection. Useful for separating management traffic, connecting to a different VLAN, or as a failover link. Unlike the DS925+ with its dual 2.5GbE ports, the DS425+ cannot achieve a 5Gbps link-aggregated connection, which limits throughput for multi-user environments or heavy simultaneous access patterns.

Docker and Application Performance

The DS425+ supports Container Manager, but practical container capacity depends on image architecture, memory and CPU demand, storage I/O, traffic and other services running on the NAS. The default 2GB of RAM will feel tight with Docker, though, so budget for a 4GB upgrade module (bringing the total to 6GB) if you plan to run containers. Synology specifies its D4NS01-4G expansion module and warns that using non-Synology memory may limit warranty or technical support.

Where the J4125 falls short is in heavier workloads. Stock DSM does not provide supported Plex hardware transcoding on the DS425+. Performance with simultaneous Synology Drive, Surveillance Station and container workloads depends on user activity, camera settings, memory, storage and network configuration. That is squarely DS925+ territory, where the AMD Ryzen V1500B delivers meaningfully more multi-threaded performance and ECC RAM provides data integrity under sustained load.

Power Consumption and Noise

At 28.25W under access load and 6.10W in HDD hibernation, the DS425+ is impressively efficient for a 4-bay NAS running an x86 processor. Using Synology's 28.25W access-test figure as a constant 24/7 draw would equal about 247kWh per year. At an illustrative electricity usage rate of $0.30-$0.35/kWh, that would cost about $74-$87 per year; actual cost will vary with workload, drive activity and your plan's tariff. Comparable to the DS423 and meaningfully less than the DS925+. Synology rates the DS425+ at 21.6 dB(A) in an idle-state test using Synology SATA SSDs; real noise depends on drive choice, activity and fan mode. See our NAS power consumption guide for detailed running cost calculations.

DSM Software Experience

The DS425+ runs DiskStation Manager (DSM) 7.2 or later, which is the same software across every current Synology Plus series model. DSM is Synology's biggest competitive advantage. It is aggressively designed for ease of use, with a clean interface that does not overwhelm new users while still providing genuine depth for advanced workflows. The word "overwhelming" is rarely used to describe DSM, whereas it comes up frequently in QNAP discussions.

Key DSM features available on the DS425+:

• Synology Drive: Private cloud file sync across devices. Essentially your own Dropbox replacement
• Hyper Backup: Versioned, encrypted backups to external drives, remote NAS, or cloud destinations (C2, AWS S3, Azure, Backblaze B2)
• Active Backup for Business: Centralised backup for PCs, servers, and VMs. Included free with no per-device licensing
• Container Manager: Docker container support for self-hosted applications
• Surveillance Station: IP camera recording with 2 free camera licenses (additional licenses from $95 at Scorptec)
• Synology Photos: AI-powered photo management and sharing
• Btrfs file system: Enables snapshots and data checksumming; file self-healing requires data checksums on the shared folder and a supported redundant RAID configuration

If you are buying a Synology NAS, you are paying for DSM. The hardware is competent but unremarkable. It is the software ecosystem that justifies the Synology premium. If your requirements boil down to basic backup and file access without using DSM's advanced features, consider whether a less expensive alternative like the QNAP TS-464 or Asustor AS5404T delivers better value for your specific needs.

The Drive Compatibility Question

Any review of a 2025-era Synology Plus series NAS needs to address the drive compatibility controversy. In April 2025, Synology announced that new Plus series models would require Synology-branded or Synology-certified drives. Non-approved drives were blocked from creating new storage pools and lost access to drive health monitoring. The enthusiast community reacted harshly. Long-time Synology users began exploring QNAP, TrueNAS, and other alternatives.

Synology reversed course with DSM 7.3 in October 2025, restoring the ability to use third-party 3.5-inch HDDs and 2.5-inch SATA SSDs from brands like Western Digital and Seagate on desktop Plus series models including the DS425+. Storage pool creation and health monitoring work normally with drives from the major NAS drive brands.

While the technical restrictions have been largely reversed for consumer models, the reputational damage is real. Synology took a significant hit in the enthusiast space, and some of that trust will take time to rebuild. On DSM 7.3, third-party HDDs such as IronWolf and WD Red models can be used if they are not on Synology's incompatibility list, but support for issues caused by an unlisted drive or its firmware may be limited. But it is worth knowing this history before committing to the platform.

DS425+ vs DS925+. Which 4-Bay Synology to Buy

This is the critical comparison for Australian buyers. Both are 4-bay Plus series models on the shelf right now. At Scorptec's prices checked on 16 September 2026, the DS425+ was $899 and the DS925+ was $1,049, a $150 gap. Here is how they stack up:

Buy the DS425+ if: You want a 4-bay Synology NAS for straightforward file storage, backup, Synology Drive sync, and maybe a few light Docker containers. You do not need expansion beyond four bays. You are comfortable with 6GB maximum RAM. The $175+ saving over the DS925+ matters to your budget, and you will use the savings toward drives or a UPS.

Buy the DS925+ instead if: You want dual 2.5GbE for link aggregation, ECC RAM for data integrity, the option to expand to 9 bays with the DX525 expansion unit ($879 at Mwave), or you plan to run heavier workloads. The DS925+'s AMD Ryzen V1500B delivers meaningfully more sustained performance, and 32GB maximum RAM gives you serious headroom for Docker, Surveillance Station, and virtualisation. Read the full DS925+ review and our DS925+ vs DS725+ comparison for more detail.

At Scorptec's pricing checked on 16 September 2026 ($899 vs $1,049), the gap was $150; reassess the value conclusion using live prices. At PLE's pricing ($999 vs the DS925+ at $1,199), the gap is the same $200, so the same reasoning applies: pay it only if you want the Ryzen CPU and ECC memory. Price-shop this one carefully.

Storage and RAID Configuration

The DS425+ supports Synology Hybrid RAID (SHR), SHR-2, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, and JBOD. For most home and small office users, SHR with one-drive redundancy is the recommended configuration. It allows mixed drive sizes, protects against a single drive failure, and is the simplest to manage. With four 8TB drives in SHR, you get approximately 24TB of usable storage. With four 16TB drives, approximately 48TB usable. See our RAID explained guide for a detailed breakdown of each level.

Btrfs is the file system to choose on the DS425+. It enables snapshots, folder-level quotas and checksumming; automatic repair of silent corruption requires data checksums to be enabled and a supported redundant RAID configuration. EXT4 is still available if you have a specific reason to use it, but Btrfs is the default recommendation for any Plus series model. The combination of Btrfs and SHR provides a solid data protection baseline. Though remember, RAID is not a backup. A proper 3-2-1 backup strategy is essential regardless of your RAID level.

Who the DS425+ Is For

The DS425+ occupies a specific niche in the Synology lineup. It is not the cheapest 4-bay option (that is the DS423 at ~$629-$729), and it is not the most capable (that is the DS925+ at $1,048). It sits in the middle, and that positioning works best for these use cases:

Home media and backup: Storing family photos, videos, documents, and device backups. Synology Photos provides excellent photo management. Hyper Backup handles versioned backups. The 2.5GbE port makes large photo and video library access noticeably faster than 1GbE.

Small office file server: Shared folders, user accounts, Active Directory integration, and centralised backup for a handful of workstations. Active Backup for Business is included free. No per-device licensing. This can make the DS425+ a backup server for a small office, but suitability depends on backup concurrency, data-change rate, file sizes, memory, storage and other services running on the NAS.

Synology Drive deployment: Running your own private cloud for file sync across devices. The J4125 handles Synology Drive comfortably for a small team or family. Whether the DS425+ pays for itself compared with cloud storage subscriptions depends on capacity, drive and backup costs, electricity use, the cloud plan and the number of users.

Light self-hosting: Running a few Docker containers for home automation, ad blocking, or personal services. Upgrade the RAM to 6GB and keep the container count modest. For heavier self-hosting workloads, the DS925+ or a dedicated Docker-focused NAS is the better path.

Who Should Skip the DS425+

Plex enthusiasts: On the stock DSM configuration, the DS425+ does not provide supported Plex hardware transcoding; software-transcoding capability varies by codec, bitrate, resolution and subtitle handling. The DS925+ with its Ryzen V1500B is a better foundation for Plex media serving.

Buyers who need expansion: The DS425+ does not support the DX525 expansion unit. If your storage needs might grow beyond four bays, start with the DS925+ which can expand to 9 bays, or consider the 5-bay DS1525+ ($1,739) for even more headroom.

Business-critical deployments: The lack of ECC RAM means the DS425+ has no hardware protection against memory errors. For a NAS storing business data in a production environment, ECC RAM (available on the DS925+) provides a meaningful safety net. The DS425+ also maxes out at 6GB RAM, which limits the number of concurrent services and users it can handle gracefully.

NBN remote access users on CGNAT: This is not specific to the DS425+ but worth noting. If your NBN connection uses Carrier-Grade NAT (common on some RSPs), QuickConnect and Synology's relay servers handle remote access without port forwarding. Ordinary inbound IPv4 VPN or DDNS access generally will not work behind CGNAT unless the provider supplies a public IP or another supported inbound-access arrangement. Check with your internet provider before assuming remote access will work seamlessly. Upload speed depends on access technology and retailer: current NBN Home Fast I offers 5-20 Mbps upload on FTTN/B and 20 Mbps on FTTC, while eligible FTTP/HFC Home Fast II offers 50 Mbps. Factor this into your expectations.

Warranty and Australian Consumer Law

The DS425+ ships with a 3-year manufacturer warranty, extendable to 5 years with Synology's EW201 extended warranty add-on. This aligns with standard consumer NAS warranty periods and matches the typical 3-year warranty on NAS-class hard drives like the Seagate IronWolf and WD Red Plus.

Whether a dead NAS counts as a major or minor failure under ACL depends on the situation, not a fixed rule. It's a major failure if it can't be used for its normal purpose and can't easily be fixed within a reasonable time, in which case you choose a refund or replacement. Otherwise it's treated as minor, and the retailer can choose to repair or replace it first, though you can request a refund if they can't fix it within a reasonable time. This is why buying from a retailer with good after-sales support matters more than saving $20. Scorptec and PLE both have physical warehouses and established support processes. Amazon AU offers excellent returns and refunds, but if your NAS fails and you need a direct replacement of an older or less common model, Amazon may not have stock. Amazon's remedy and availability of a same-model replacement depend on the seller, stock, fault and applicable Australian Consumer Law rights. See our where to buy NAS in Australia guide for detailed retailer comparisons.

Remember: a NAS is not a backup. Plan for hardware failure, plan for possible replacement delays and confirm the retailer's current assessment, stock and return process, and build your data protection strategy around the assumption that your NAS will eventually fail. ACL remedies concern the defective product and may also include compensation for reasonably foreseeable loss or damage, but they do not replace a proper data backup.

Pros and Cons

Star Rating

The DS425+ earns a solid 4 out of 5. It is a competent, well-built 4-bay NAS with the full DSM software experience, sensible power consumption, and a useful 2.5GbE networking upgrade. It loses a point because the DS925+ offers ECC RAM, dual 2.5GbE, expansion support and a higher RAM ceiling, while the DS425+ uses less power in Synology's access test. ECC RAM, dual 2.5GbE, expansion support, and a stronger CPU. The relative value depends on live retailer pricing; on 16 September 2026 the gap was $150 at Scorptec and $182 between the lowest displayed market listings. At Scorptec's $899 price, the DS425+ is a fair deal. At PLE's $999, it is overpriced.

Related reading: our NAS buyer's guide.

Use our free NAS Sizing Wizard to get a personalised NAS recommendation.

See also: our complete Synology ecosystem guide.

See also: our complete Synology NAS Australia guide.

Related reading: our Synology DS425+ vs DS925+.

See also: our complete Synology ecosystem guide.

Is the Synology DS425+ worth buying over the DS423 in Australia?

Yes, if you want Docker support, Btrfs snapshots, and faster networking. The DS423 supports Btrfs and Container Manager on current DSM releases, although its ARM architecture limits container-image compatibility compared with the DS425+'s x86 platform. Two features that define the Plus series experience. The DS425+ adds a 2.5GbE port, M.2 NVMe cache slots, and broader x86 container-image compatibility. At $899 vs $635 (Scorptec pricing checked on 16 September 2026), the premium is $264; whether it is justified depends on the buyer's need for 2.5GbE, M.2 slots and broader x86 container compatibility. If you genuinely only need basic file storage and backup with no interest in containers or advanced features, the DS423 saves money without sacrificing core functionality.

Can I use Seagate IronWolf or WD Red drives in the DS425+?

Yes. Synology reversed the third-party drive restrictions with DSM 7.3 in October 2025. On desktop DS Plus models running DSM 7.3, third-party HDDs and 2.5-inch SATA SSDs that are not listed as incompatible are supported for installation and storage-pool creation; consult Synology's compatibility database for the exact model and firmware. A stricter ongoing restriction applies to M.2 NVMe SSDs, which must be on Synology's Hardware Compatibility List (HCL) for new cache or storage pool creation. Check the HCL before purchasing NVMe drives.

How much does the DS425+ cost to run on Australian electricity?

At 28.25W under typical access load, the DS425+ draws approximately 247 kWh per year running 24/7. At an illustrative electricity usage rate of $0.30-$0.35/kWh, that equates to roughly $75-85 per year. Or about $1.50-1.65 per week. In HDD hibernation mode (6.10W), power costs drop significantly, though hibernation is not practical for NAS devices that need to respond to network requests throughout the day. This is comparable to other 4-bay NAS models and well within the range of acceptable running costs for a home appliance.

Should I buy the DS425+ or DS925+ in Australia?

It depends on your workload and where you buy. At Scorptec pricing checked on 16 September 2026 ($899 vs $1,049), the $150 gap makes the DS425+ reasonable for light use cases. Basic file storage, backup, Synology Drive, and a few Docker containers. The DS925+ is the better investment if you need ECC RAM, dual 2.5GbE, expansion to 9 bays via the DX525, or plan to run heavier workloads. At PLE pricing ($999 vs DS925+ elsewhere at $995-$1,199), the DS425+ makes no financial sense. Pay the same or slightly more for significantly better hardware. Price-shop carefully.

Can I expand the DS425+ beyond 4 drive bays?

No. The DS425+ does not support external expansion units like the DX525. Your storage is limited to the four internal 3.5-inch/2.5-inch bays plus the two M.2 NVMe slots. If you anticipate needing more than four bays in the future, the DS925+ supports the DX525 5-bay expansion unit ($879 at Mwave), giving a total of 9 bays. Alternatively, the 5-bay DS1525+ ($1,600-$1,759) provides more native capacity from the start.

What RAID level should I use on the DS425+?

Synology Hybrid RAID (SHR) with one-drive redundancy is the recommended configuration for most home and small office users. SHR allows mixed drive sizes, protects against a single drive failure, and is the simplest to manage through DSM. With four identical drives, SHR provides the same usable capacity as RAID 5. If you want protection against two simultaneous drive failures, SHR-2 or RAID 6 sacrifices one additional drive's worth of capacity for extra redundancy. Remember that RAID is not a backup. Always maintain a separate offsite copy of critical data.

What is the warranty on the DS425+ in Australia?

The DS425+ has a 3-year manufacturer warranty, extendable to 5 years with Synology's EW201 add-on. For an Australian Consumer Law remedy, contact the seller first. Synology limited-warranty troubleshooting can begin with Synology Technical Support, with an approved replacement handled through the local reseller or distributor. The warranty path and turnaround vary by seller, claim type, diagnosis, return location and replacement stock; confirm the process with the retailer or Synology before purchase. Australian Consumer Law protections apply when buying from Australian retailers. Advanced replacements are generally not offered through standard warranty, so ask your retailer about their process before purchasing. For general consumer guidance on your rights, visit accc.gov.au.

Can I access the DS425+ remotely over NBN?

Yes, but with caveats. Synology's QuickConnect relay service works on most NBN connections, including those behind CGNAT (Carrier-Grade NAT), providing browser-based access to DSM and Synology Drive. For direct VPN or DDNS-based remote access, you need a public IP address. CGNAT blocks this on some RSPs. Current NBN upload speeds depend on access technology and tier: Home Fast I provides 5-20 Mbps on FTTN/FTTB and 20 Mbps on FTTC, while eligible FTTP/HFC Home Fast II provides 50 Mbps wholesale upload. If remote access is important to your use case, verify your NBN connection type with your provider before purchasing.