The most cost-effective entry point for household backup, personal cloud, and quiet living-room media streaming.
A 2-bay NAS operates in a simple 2-drive mirror (RAID 1 / SHR), delivering 50% storage efficiency and 1-drive failure protection. Choose the Synology DS225+ for balanced DSM software & 2.5GbE speed, UGREEN DXP2800 for Intel N100 4K Plex hardware transcoding, or Synology DS223 for straightforward budget household backup.
The same NAS can fit an enclosure budget and exceed a budget including drives. These examples use two exact 4TB drives; they are dated calculations, not checkout offers or suitability rankings.
2 bays · Realtek RTD1619B · 4-core · 1GB DDR4 · 1 × 1GbE
NAS only: $209.99 · Dated price estimate · 2026-10-09T03:59:05.715621+00:00
With 2 × ST4000VN006 4TB: $589.97 · Dated price estimate · oldest record 2026-10-09T03:58:24.994342+00:00
8TB raw. Usable capacity depends on the supported storage layout. Tax, shipping and separate backup excluded; stock and current prices need checking.
DS223j + 2 × ST4000VN006: component build and cost →2 bays · Intel N100 · 4-core · 8GB DDR5 · max 16GB · 1 × 2.5GbE
NAS only: $389.99 · Historical price estimate · 2026-09-27T15:10:58.133099+00:00
With 2 × ST4000VN006 4TB: $769.97 · Historical price estimate · oldest record 2026-09-27T15:10:58.133099+00:00
8TB raw. Usable capacity depends on the supported storage layout. Tax, shipping and separate backup excluded; stock and current prices need checking.
NASync DXP2800 + 2 × ST4000VN006: component build and cost →Independently evaluated hardware configurations with verifiable specifications and total build calculations.
Intel Celeron J4125 · 4-core · 1 × 2.5GbE + 1 × 1GbE
Delivers the most polished household experience with Synology Photos AI indexing, supported Btrfs snapshots and retention controls, and 2.5GbE LAN without high operating noise or idle power draw.
DS225+ specifications and dated prices describe the enclosure. The DS225+ + 2 × ST4000VN006 (4TB) configuration records an estimated total of $744.97 and 4TB planning capacity with SHR / RAID 1 Mirror (50% usable). Prices are dated observations, excluding tax and shipping; check the configuration details before buying.
Base 2GB memory can index slowly during massive initial RAW photo imports; internal capacity expansion requires replacing one disk at a time, completing each rebuild, then expanding the supported pool.
Intel N100 · 4-core · 1 × 2.5GbE
Intel N100 with Quick Sync is a useful budget option for supported Plex hardware transcoding. The 8GB memory, dual M.2 slots, and 2.5GbE also suit light services; test your codecs, subtitles, and tone-mapping path.
NASync DXP2800 specifications and dated prices describe the enclosure. The NASync DXP2800 + 2 × ST4000VN006 (4TB) configuration records an estimated total of $769.97 and 4TB planning capacity with RAID 1 Mirror (50% usable). Prices are dated observations, excluding tax and shipping; check the configuration details before buying.
UGOS is a younger operating system with a shorter enterprise and security track record than Synology DSM or QNAP QTS.
Realtek RTD1619B · 4-core · 1 × 1GbE
An entry DSM option for file backups, Time Machine, and Hyper Backup when a two-drive mirror meets your capacity needs. Check required packages against this model before purchase.
DS223 specifications and dated prices describe the enclosure. The DS223 + 2 × ST4000VN006 (4TB) configuration records an estimated total of $634.97 and 4TB planning capacity with SHR / RAID 1 Mirror (50% usable). Prices are dated observations, excluding tax and shipping; check the configuration details before buying.
Fixed 2GB RAM and 1GbE limit growth and busy backup windows; this is not our choice for hardware-transcoding Plex or VMs.
An enclosure without hard drives stores 0 bytes. Below is the exact financial breakdown when populated with verified CMR drives.
| Storage Goal | Hard Drive Selection | Array Layout & Usable Space | Est. HDD Cost | Sample Complete Total | Cost / Usable TB |
|---|---|---|---|---|---|
| Entry 4TB Usable (2 × 4TB CMR) | 2 × 4TB (ST4000VN006) Seagate CMR | 4TB Usable RAID 1 / SHR Mirror (50% efficiency · 1-drive tolerance) | $379.98 | $744.97 Recorded retailer prices | $186.24/TB |
| Mid 8TB Usable (2 × 8TB CMR) | 2 × 8TB (ST8000VN004) Seagate CMR | 8TB Usable RAID 1 / SHR Mirror (50% efficiency · 1-drive tolerance) | $659.98 | $1,024.97 Recorded retailer prices | $128.12/TB |
| Max 16TB Usable (2 × 16TB CMR) | 2 × 16TB (ST16000NT001) Seagate CMR | 16TB Usable RAID 1 / SHR Mirror (50% efficiency · 1-drive tolerance) | $1,159.98 | $1,524.97 Recorded retailer prices | $95.31/TB |
Totals use the exact listed NAS and drive model, with recorded retailer prices where available and reference prices otherwise. They exclude tax, shipping, UPS, and separate backup storage. Capacity is decimal TB before system/filesystem overhead and free-space reserves; TB-to-TiB conversion is a change of units, not formatting loss.
Check the source details: DS925+ hardware and expansion, DXP2800 supported memory, and Plex hardware acceleration requirements.
A factual breakdown of why bay count fundamentally changes storage math, expansion friction, and dollar-per-terabyte value.
50% Storage Efficiency (1 Drive Data + 1 Drive Mirror)
75% Storage Efficiency in RAID 5 (3 Drives Data + 1 Drive Parity)
Evidence Note: To achieve 24TB usable in a 2-bay NAS, you must buy two expensive 24TB flagship drives. A 4-bay NAS reaches 24TB with three modest 12TB drives, saving significant hard drive budget.
Replace both drives sequentially with full array rebuilds
Add drives to free bays when the operating system and RAID layout support expansion
Evidence Note: Keep a tested independent backup. Replace one disk at a time, wait for a healthy completed rebuild, then repeat and expand the volume. Rebuild time and service impact depend on capacity and workload.
Compact (~165 × 108 × 232 mm), quiet (under 20 dB(A) with 5400rpm disks)
Larger chassis, requires more airflow and produces higher resonance
Evidence Note: Two 5400rpm CMR drives can sit on a study desk. Four 7200rpm drives generate noticeable vibrational noise and belong in a closet or utility area.
Lower initial disk count: enclosure + 2 drives
Budget for the enclosure and the number of drives you install
Evidence Note: A 2-bay NAS remains the lowest upfront cash barrier to owning a dedicated, private, and non-subscription personal cloud storage server.
Showing 36 models with recorded or reference pricing, CPU, and networking.
For most home users, the Synology DS225+ offers the best overall balance of mature backup software, 2.5GbE networking, and automatic phone photo backup. For budget buyers seeking 4K Plex hardware transcoding, the UGREEN DXP2800 with Intel N100 delivers superior raw hardware specifications.
Use the cost table on this page for the exact enclosure and drive models. Disk capacity can change the total substantially, and recorded prices can differ from checkout. Add tax, shipping, an independent backup destination, and any UPS or networking you need.
Direct Play depends on client support and network bandwidth. For transcoding, an Intel iGPU can help on a supported Plex setup with Plex Pass, but codecs, HDR tone mapping, subtitles, and software versions determine the result. Bay count alone tells you nothing about conversion performance.
A 2-bay NAS has a lower upfront entry price and compact desktop footprint. However, a 4-bay NAS is significantly more cost-effective per usable terabyte because RAID 5 achieves 75% storage efficiency compared to only 50% in a 2-bay RAID 1 mirror.
Yes. In a 2-bay mirrored array (SHR or RAID 1), you replace one drive with a larger disk, wait for the storage pool to rebuild, then replace the second drive and expand the volume capacity in your NAS control panel.