# What NAS devices offer the best backup and sync features? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

What NAS devices offer the best backup and sync features?

## Products

### ASUSTOR Drivestor 2 Lite
```yaml
product: asustor-drivestor-2-lite
brand: ASUSTOR
price_gbp: 141.69
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
raid_support: RAID 0, RAID 1, JBOD
number_of_bays: 2
transfer_speed: 1000 Mbit/s
storage_capacity: 36 TB
power_consumption: 11.7 W
expandable_storage: 36 TB
```

- **Price:** £141.69 [^1]
- **Summary:** The ASUSTOR Drivestor 2 Lite is a two-bay, diskless NAS supporting up to 36 TB of storage with Gigabit Ethernet transfer speeds. It suits home users and small offices needing centralized file storage, backups, cloud synchronization, and RAID 1 redundancy.
- **Ideal For:** It suits backup and sync needs through its two-bay RAID 1 support, Btrfs and iSCSI snapshots, Rsync, cloud-sync protocols, and 1000 Mbit/s network connection.
- **Additional Sources:** [^2], [^3]

### Synology DS1825+
```yaml
product: synology-ds1825
brand: Synology
price_gbp: 1074.95
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
raid_support: Synology Hybrid RAID, RAID 1, RAID 5, RAID 6, RAID 10
number_of_bays: 8
transfer_speed: Up to 2,239 MB/s read and 1,573 MB/s write
storage_capacity: 192 TB raw
power_consumption: 60.1 W access, 18.34 W HDD hibernation
expandable_storage: Up to 432 TB raw with two DX525 expansion units
```

- **Price:** £1074.95 [^4]
- **Summary:** The Synology DS1825+ is an 8-bay desktop NAS supporting up to 192 TB of raw storage, with expansion to 18 bays and 432 TB using two DX525 units. Its dual 2.5GbE ports, optional 10GbE or 25GbE networking, NVMe support, and business-focused backup and file-management tools suit small businesses, professionals, and demanding home users.
- **Ideal For:** It suits users seeking strong backup and sync features because Synology Drive supports cross-platform and site-to-site syncing, while Active Backup Suite centralizes backups for Windows, Linux, macOS, virtual machines, and cloud services, backed by 8 bays, SHR and RAID support, and up to 2,239 MB/s read speeds.

### Synology DS425+
```yaml
product: synology-ds425
brand: Synology
price_gbp: 626.81
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
raid_support: Synology Hybrid RAID, RAID 1, RAID 5
number_of_bays: 4 x 3.5in SATA HDD or 2.5in SATA SSD
transfer_speed: Up to 278 MB/s read and 281 MB/s write
storage_capacity: Up to 96 TB raw storage
power_consumption: 28.25 W access; 6.10 W HDD hibernation
expandable_storage: Internal volumes expandable up to 108 TB; 2 x M.2 2280 NVMe slots for caching
```

- **Price:** £626.81 [^5]
- **Summary:** The Synology DS425+ is a compact four-bay NAS with 2.5GbE networking, up to 96 TB of raw storage, and M.2 NVMe caching support. It suits homes and small businesses needing centralized file storage, backups, synchronization, and straightforward data management.
- **Ideal For:** The DS425+ is well suited to backup and sync because DSM supports centralized device backups, file synchronization, offsite replication, and Btrfs-based data protection, while its four bays and RAID support provide room for resilient storage.
- **Additional Sources:** [^6], [^7]

### Synology DS925+
```yaml
product: synology-ds925
brand: Synology
price_gbp: 515.65
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
raid_support: Synology Hybrid RAID, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, JBOD, Basic
number_of_bays: 4
transfer_speed: 522 MB/s read, 565 MB/s write
storage_capacity: 96 TB raw
power_consumption: 37.91 W
expandable_storage: 216 TB raw with DX525 expansion unit
```

- **Price:** £515.65 [^8]
- **Summary:** The Synology DS925+ is a diskless 4-bay NAS with dual 2.5GbE networking, two M.2 NVMe slots, ECC memory, and fast sequential read and write performance. It suits home offices, small businesses, and teams that need reliable file storage, backup, synchronization, and room to expand.
- **Ideal For:** It is well suited to backup and sync because DSM supports Active Backup, Hyper Backup, Snapshot Replication, and Synology Drive, while dual 2.5GbE networking delivers up to 522 MB/s read and 565 MB/s write speeds.
- **Additional Sources:** [^9], [^10], [^11], [^12], [^13]

### TerraMaster F4-424
```yaml
product: terramaster-f4-424
brand: TerraMaster
price_gbp: 1977.14
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
raid_support: TRAID, Single, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10
number_of_bays: 4
transfer_speed: 283 MB/s
storage_capacity: 88 TB
power_consumption: 33.0 W read/write; 13.0 W hibernation
expandable_storage: USB DAS and 2 M.2 NVMe slots
```

- **Price:** £1977.14 [^14]
- **Summary:** The TerraMaster F4-424 is a four-bay, diskless NAS supporting up to 88 TB of internal raw storage, dual 2.5GbE networking, and transfer speeds up to 283 MB/s. It suits home users, SOHO setups, and small businesses needing scalable storage, RAID protection, and SSD caching.
- **Ideal For:** It suits users seeking strong backup and sync features because its four bays support RAID 1, RAID 5, RAID 6, RAID 10, and TRAID, while TOS supports backup applications and the unit can expand through USB DAS storage and M.2 NVMe caching.

### ASUSTOR Lockerstor 4 Gen2 AS6804T
```yaml
product: asustor-lockerstor-4-gen2-as6804t
brand: ASUSTOR
price_gbp: 1490.85
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
raid_support: Single, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10
number_of_bays: 4
transfer_speed: 2303 MB/s sequential read, 2353 MB/s sequential write
storage_capacity: 144 TB
power_consumption: 34 W operation, 2.3 W sleep mode
expandable_storage: Up to 16 drives with expansion devices; 4 M.2 NVMe slots
```

- **Price:** £1490.85 [^15]
- **Summary:** The ASUSTOR Lockerstor 4 Gen2 AS6804T is a high-performance, diskless four-bay NAS with four additional M.2 NVMe slots and dual 10GbE plus dual 5GbE networking. It suits power users, creative professionals, and small businesses that need fast file transfers, flexible storage expansion, and robust RAID protection.
- **Ideal For:** It suits backup and sync workloads through RAID 1, 5, 6, and 10 support, remote sync, cloud backup, FTP backup, external backup, one-touch backup, EZ Sync, SMB backup, and expansion to up to 16 drives.
- **Additional Sources:** [^16]

### QNAP TVS-h674
```yaml
product: qnap-tvs-h674
brand: QNAP
price_gbp: 1402.01
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
raid_support: RAID 0, 1, 5, 6, 10, 50, 60, JBOD
number_of_bays: 6
transfer_speed: 2 x 2.5GbE
expandable_storage: PCIe expansion cards and QNAP expansion units
```

- **Price:** £1402.01 [^17]
- **Summary:** The QNAP TVS-h674 is a six-bay NAS with two 2.5GbE ports, dual M.2 PCIe slots for SSD caching and tiering, and two PCIe expansion slots. It suits small businesses and advanced home users needing high-speed centralized storage, virtualization, backups, and future expansion.
- **Ideal For:** The TVS-h674 suits users seeking strong backup and sync features because its six bays support redundant RAID configurations, while QuTS hero provides snapshot-based protection and the two 2.5GbE ports enable fast synchronization across devices.
- **Additional Sources:** [^18], [^19]

---
## References & Sources
[^1]: Galaxus, accessed 2026-09-13. https://www.galaxus.at/en/s1/product/asustor-drivestor-2-lite-as1102tl-2-bay-0-tb-nas-41399575
[^2]: Multitronic, accessed 2026-09-13. https://www.multitronic.fi/en/products/4520070/asustor-drivestor-2-lite-as1102tl---2-bay-network-attached-storage--black
[^3]: ElecBoy, accessed 2026-09-13. https://www.elecboy.com.hk/en/products/asustor-drivestor-2-lite-as1102tl-nas
[^4]: NAS Store, accessed 2026-09-13. https://nasstore.eu/product/synology-ds1825/
[^5]: Scorptec, accessed 2026-09-13. https://www.scorptec.com.au/product/nas/1-4-bays/119438-ds425plus
[^6]: PLE Computers, accessed 2026-09-13. https://www.ple.com.au/products/680897/synology-diskstation-ds425-4-bay-nas-20ghz-intel-4-core-2gb-ram-25gbe-1gbe
[^7]: PB Tech, accessed 2026-09-13. https://www.pbtech.co.nz/product/NASSYN04250/Synology-DiskStation-DS425-4-Bay-NAS-Server-Celero
[^8]: CDW, accessed 2026-09-13. https://www.cdw.com/product/synology-disk-station-ds925-nas-server/8412484
[^9]: B&H Photo Video, accessed 2026-09-13. https://www.bhphotovideo.com/c/product/1898364-REG/synology_ds925_4_bay_nas_enclosure.html
[^10]: Broadbandbuyer, accessed 2026-09-13. https://www.broadbandbuyer.com/products/53794-synology-ds925/
[^11]: Scorptec, accessed 2026-09-13. https://www.scorptec.com.au/product/nas/1-4-bays/117955-ds925plus
[^12]: NAS Marketplace, accessed 2026-09-13. https://nasmarketplace.com.au/products/ds925-4bay
[^13]: Comms Express, accessed 2026-09-13. https://www.comms-express.com/products/synology-ds925-4-bay-nas-enclosure-w-2-x-m-2-nvme-slots/
[^14]: Price.com.hk, accessed 2026-09-13. https://www.price.com.hk/product.php?p=630222
[^15]: NAS Marketplace, accessed 2026-09-13. https://nasmarketplace.com.au/products/lockerstor-as6804-4bay
[^16]: MegaBuy, accessed 2026-09-13. https://www.megabuy.com.au/asustor-4-bay-nasno-disk-amd-v3c14-23ghz-16gb-m24-5g2-10g2-pcie-twr-3yr-p1387254.html
[^17]: QNAP Store, accessed 2026-09-13. https://store.qnap.com/tvs-h674-i3-16g-us.html
[^18]: Tokopedia, accessed 2026-09-13. https://www.tokopedia.com/megatronix/qnap-tvs-h674-i3-16g-6bay-nas-storage
[^19]: EnterKomputer, accessed 2026-09-13. https://www.enterkomputer.com/detail/180650/QNAP-TVS-H674-i5-32G