TLDR Review: Synology DiskStation DS425+
Pros
- •Reliable and effective performance with a rocolid, mature operating system (Synology DSM) known for stability and well-designed apps like Active Backup for Business.
- •Very good build quality featuring 4 howap removable bays for hard disks, making drive management seamless.
- •Compatible out of the box with major drives like Seagate IronWolf Pro 22TB and tested with Seagate IronWolf 20TB drives, offering flexibility within supported options.
- •Supports 2.5 Gb Ethernet for faster network transfer speeds compared to older models.
- •Processor supports transcoding, which is a nice bonus rarely found in recent Synology NAS models.
- •Synology DSM OS delivers a sleek, responsive, and featuracked experience including surveillance, virtual machines, cloud syncing, and strong app integration rivaling full-scale servers.
- •Low RAM usage during RAID rebuilds (only about 33% of base 2GB RAM), indicating efficiency in resource management.
- •Setup process is intuitive with simple user account and device connection configurations, making backups and media streaming easy.
- •Excellent customer support from Synology enhances overall product ownership satisfaction.
Cons
- •The processor and base RAM (2GB, expandable only up to 8GB) are somewhat dated, limiting performance headroom, especially for heavy multitasking or more demanding workloads.
- •Synology is enforcing strict restrictions from 2025 onwards on thirarty drives, RAM, and NVMe SSDs, pushing users into their branded hardware ecosystem, which impacts upgrade flexibility and cost.
- •Transcoding on Plex is limited or disabled due to licensing restrictions, reducing multimedia server functionality for users relying on Plex.
- •Memory upgrades require expensive, serverade Synology-specific RAM and SSDs, adding to total ownership cost.
- •Migration from older NAS devices with large data volumes can be slow, involving lengthy parity checks and reset of admin credentials posigration, which may cause some inconvenience.
- •Using noynology SSDs (such as Samsung 990) requires workarounds like disabling compatibility checks via SSH, a technical step not suitable for typical users.
- •Although network speed supports 2.5 Gb Ethernet, migration speeds may still be bottlenecked by older gear connected to slower 1 Gb/s Ethernet.
- •For users who want to tinker with hardware or use noynology parts freely, the DS425+ is restrictive and less flexible compared to some alternatives.
- •Expansion options and a better processor on the Synology DS920+ or DS925+ may be more appealing for heavy use or futurroofing, though at a higher price.
Bottom Line
The Synology 4-Bay DiskStation DS425+ (Diskless) is a solid choice for users who prioritize a mature, reliable NAS OS with strong backup and media features in a compact 4-bay form factor. However, its older CPU, limited RAM, and upcoming restrictions on third-party hardware mean it's best suited for budget-conscious buyers who plan to stay within Synology’s ecosystem and have moderate performance needs. If you want more power, flexibility, or less vendor lock-in, consider stepping up to the DS920+ or DS925+ models which offer better processors, expansion, and fewer restrictions.
How we researched this
About this review: We pulled together findings from professional reviews and hundreds of user reviews, and cross-referenced them with ShopSavvy's pricing data from thousands of retailers to give you the short version.
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