Synology DS223 vs DS225+

Choose the Synology DS223 for straightforward household backup, photo storage and light file sharing; choose the DS225+ when faster networking, expandable memory, business backup software or virtual machines are part of the workload. A NAS, or network-attached storage device, connects to a router and lets computers, phones and other authorised devices use the same storage and backup destination. Think of it as a shared digital filing cabinet that remains in your home or office rather than sitting on one person's computer. This comparison is for a home or small-office buyer who has narrowed the purchase to Synology's two current two-bay models. The likely trigger is running out of computer or cloud storage, replacing scattered USB drives, or discovering that a basic file server may not leave enough room for future applications. The required outcome is a justified choice based on workload, network, protection needs and the $120 price difference. Not a declaration that one enclosure is universally better.

Quick decision matrix

Choose neither model if two drive bays will not accommodate expected growth, the NAS will hold the only copy of important data, or the job depends on effortless real-time video conversion. Those situations call for a four-bay model or a proper backup plan alongside either enclosure.

Synology DS223

The DS223 is the more economical choice for storage-first workloads that do not need multi-gigabit networking or memory expansion. It uses a four-core Realtek RTD1619B processor, has 2GB of fixed DDR4 memory, one 1GbE network port and three USB 3.2 Gen 1 ports, according to Synology's official specifications.DSM (Synology's operating system) provides the browser-based interface and applications used to configure both models. It is like the dashboard of a car: the enclosure supplies the machinery, while DSM is where the owner controls users, storage, backups and updates. The DS223 supports Btrfs, a file system that can use checksums and snapshots to help identify corruption and recover earlier file states. Snapshots work like dated save points in a document: they can roll a changed or deleted file back, but they do not protect against every copy of the data being destroyed.For a household collecting phone photos, backing up a few computers and sharing documents, the DS223's fixed 2GB memory is adequate when applications are kept under control. Synology's own comparison data suggests up to five Synology Drive users for the tested workload, compared with ten on the DS225+, though these are planning figures rather than hard connection limits. SMB (the network file-sharing protocol Windows uses) is supported by both models, letting NAS folders appear and behave much like ordinary network drives.

DS223 specifications

DS223 advantages and limitations

No numeric review score is assigned here. This comparison is based on official specifications, package support and workload modelling rather than direct hands-on testing, so a numeric performance or value score would imply evidence that was not collected.

Synology DS225+

The DS225+ is the stronger choice when the NAS must do more than store and serve files. Synology specifies a four-core Intel Celeron J4125 running at 2.0GHz base with a 2.7GHz turbo frequency, 2GB of DDR4 memory expandable to 6GB, one 2.5GbE port, one 1GbE port and two USB 3.2 Gen 1 ports.A 2.5GbE connection is Ethernet capable of carrying 2.5 gigabits per second under ideal conditions. Imagine widening a single-lane driveway: it does not make the cars themselves faster, but it lets much more traffic pass when the NAS, switch, cabling and client all support the wider lane. Synology advertises sequential performance above 282MB/s for reads and 217MB/s for writes under its own test conditions. Actual results depend on the drives, storage layout, file sizes, client, switch, cabling and concurrent applications, so treat those figures as a controlled vendor result rather than a promise for every desk.The DS225+ is also on Synology's supported-model list for Active Backup for Business, its central application for backing up supported computers, servers and virtual machines. Think of it as one reception desk coordinating protection for several separate devices. It is also supported for Virtual Machine Manager, with Synology recommending no more than two virtual-machine instances depending on configuration and memory. That specification does not make the DS225+ a heavy virtualisation server; it makes it suitable for a small test system or lightweight service once the memory is expanded.Docker is software that runs applications in isolated containers without affecting the core operating system. Containers are like separate lunchboxes in one refrigerator, each holding its own contents but sharing the same appliance. Synology has added ARMv8 support for the DS223 to Container Manager, so it is no longer accurate to say the cheaper model cannot run containers at all. The DS225+ remains the safer choice for container workloads because its x86 architecture, expandable memory and broader business-package support reduce the chance that software compatibility or memory becomes the first constraint.

DS225+ specifications

DS225+ advantages and limitations

A fair numeric score would require controlled transfer, application, noise and recovery testing on both enclosures with the same drives and network, so none is assigned here either.

DS223 vs DS225+: specifications compared

Specifications were checked against Synology's official product pages and cross-verified against NTKIT's own AU retailer price index. Manufacturer performance figures should be treated as controlled test results, not a guarantee for every setup.

How much faster can the DS225+ be?

The DS225+ produces the clearest benefit when large files move over a fully 2.5GbE local network. A 1GbE link carries a theoretical maximum of 125MB/s, while 2.5GbE raises that mathematical ceiling to 312.5MB/s before protocol overhead and other bottlenecks.At the DS223's 1GbE line-rate ceiling, transferring a 100GB project would take at least about 13 minutes 20 seconds. At Synology's advertised 217MB/s sequential write result for the DS225+, the same transfer would take about 7 minutes 41 seconds under comparable idealised conditions. These are calculations, not observed NTKIT benchmarks. Small files, slower hard drives, encryption, Wi-Fi and simultaneous users can increase both times, while a computer connected at only 1GbE removes most of the DS225+'s advantage.

Capacity, RAID and backup

Both models have two drive bays, so the processor choice does not change their fundamental capacity or protection geometry. RAID is a method of spreading data across multiple drives so the system can survive a drive failure without data loss. It is like keeping two current ledgers so work can continue when one book is damaged.SHR, or Synology Hybrid RAID, is Synology's guided approach to arranging drives and redundancy. It behaves like an organiser choosing the most useful drawer layout from the drives installed, reducing the manual calculation required from the owner. With two equal 8TB drives configured for one-drive redundancy, either NAS provides about 8TB of nominal usable capacity before file-system formatting and overhead. The second drive protects continuity after one drive fails, it does not double the usable space.RAID is not backup because deletion, ransomware, theft, fire or a serious system fault can affect the live storage and its mirror. A mirror is like a photocopier: it faithfully duplicates an accidental deletion just as readily as a wanted file. Important data should also exist on another device or service, with at least one copy kept away from the NAS.

Media serving and transcoding

For media use, both models make more sense when televisions and streaming devices can play the stored files directly. Transcoding means converting a video file from one format in real time so it plays on a device that cannot handle the original. It is like translating a live speech while the speaker is still talking. Do not buy either enclosure solely on an assumption that Plex or another third-party application will provide effortless hardware transcoding for every codec; results depend on current server software, drivers, client capabilities and media formats, and this comparison did not directly test them.

Remote access on an Australian internet connection

Remote access performance is usually limited by the internet service's upload rate rather than the NAS's local Ethernet port. A faster 2.5GbE port cannot make an NBN connection upload faster, just as widening a driveway does not increase the speed limit on the road outside. CGNAT (a cost-saving measure some ISPs use that blocks direct remote access to home networks) resembles an apartment building sharing one street address: outside visitors cannot reach a particular unit unless the building provides a forwarding system. Synology QuickConnect supports both models and can connect supported applications without user-configured port forwarding, though relay-based connections and your upload capacity may still reduce performance.

Australian pricing and ownership value

For a matched retailer comparison, PLE Computers listed the DS223 at $479 and the DS225+ at $599 when checked on 22 August 2026 (both figures independently corroborated by NTKIT's own 2026-08-16 AU retailer price scrape). Both are diskless, so the complete system still needs compatible drives and an independent backup destination. Prices and stock vary by retailer. NTKIT's own index shows the DS223 from $429 (Centre Com) and the DS225+ from $529-$576 (PCByte/MSY/Umart/DeviceDeal) at other AU retailers on the same date, so compare the complete delivered cost before ordering.At a $120 difference, the DS225+ suits buyers who can name a concrete use for 2.5GbE, memory expansion, Active Backup for Business or virtual machines. The DS223 offers better value when the workload remains file storage, photo management and scheduled backup on a 1GbE network. Paying for the DS225+ merely because it has the Plus label is poor value if its extra port, memory slot and software support go unused.

Warranty and Australian Consumer Law

The ACCC explains that the remedy for faulty goods depends on whether the failure is major or minor. The circumstances, usability and whether it can be fixed within a reasonable time all matter. This is general consumer information, not legal advice; ACL protects rights concerning the hardware purchase, but it is not a substitute for a separate copy of the data, so the backup plan must tolerate the NAS being unavailable during a claim.Before purchase, ask the retailer what happens if the enclosure fails while the drives still contain data: whether a replacement can be supplied before the faulty unit is returned, how long assessment usually takes, and what happens if the exact model is unavailable.

Verdict

Choose the DS223 for household backup, photos and documents. It suits one to three people using a 1GbE network because its core storage, Btrfs, snapshot and Synology application features solve the workload without paying for unused expansion.Choose the DS225+ for photographers and creators doing repeated large-file transfers on a 2.5GbE network, a small office protecting several computers with Active Backup for Business, or a home lab wanting Virtual Machine Manager and up to 6GB of memory. Do not assume this modest two-bay system is equivalent to a dedicated server for several busy services.Choose neither model if two bays will force an early capacity replacement. Model expected data growth first, reserve room for snapshots, and compare the lifetime cost of a current four-bay alternative.

Related reading: our NAS buyer's guide.

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Is the Synology DS225+ worth $120 more than the DS223?

It's worth the matched-retailer premium when the workload will use 2.5GbE, expandable memory, Active Backup for Business or Virtual Machine Manager. For uncomplicated backup and file storage over 1GbE, the DS223 solves the defined problem at lower cost.

Do the DS223 and DS225+ include hard drives?

No. Both are diskless enclosures, so compatible hard drives or SATA SSDs must be purchased separately, along with another destination for backup.

Can the DS223 run Docker containers?

Synology has added DS223 ARMv8 support to Container Manager, its Docker-based container application. Container images must support the DS223's ARM architecture, and its fixed 2GB memory makes it a light-duty container host rather than the preferred choice for several services.

Does the DS225+ have NVMe cache slots?

No. NVMe is a fast solid-state-drive format, but the DS225+ has no M.2 NVMe slots for cache or storage pools.

Can third-party hard drives be used in the DS225+?

Synology's DSM 7.3 update restored the ability for 2025-model Plus, Value and J-series units to install and create storage pools with non-validated third-party HDDs and 2.5-inch SATA SSDs. Check Synology's current compatibility guidance for the exact drive and DSM version before purchase, since validation and support policies can change.

Is RAID 1 or SHR enough to protect family photos?

No. RAID 1 or two-drive SHR can keep the NAS operating after one drive fails, but it cannot independently protect against deletion, malware, theft, fire or damage to the whole system. Keep a separate backup copy.

Will 2.5GbE make remote access faster over NBN?

Usually not by itself. Remote transfer speed is limited by the slowest link in the chain. NAS, local network, remote network and internet upload path. So an NBN upload limit can remain the bottleneck even when the DS225+ connects locally at 2.5GbE.

Which model is easier to use?

Both use DSM and therefore share broadly the same setup and administration interface. The DS223 is operationally simpler because there are fewer expansion and application decisions, while the DS225+ allows the system to grow into more demanding roles.