Choosing a storage NAS networking device comes down to one practical question: do you need a low-priced used NAS, a diskless two-bay enclosure, a four-bay personal-cloud unit, or server-classified hardware with named CPU and RAM details? The four choices span USD 39.00 through USD 346.97, but the more useful divider is configuration. Start with the format and included-component trade-offs that fit your intended storage setup.
Quick take
The Seagate BlackArmor NAS 400 series is the lowest-priced route and is listed as a used external drive. The 2-Bay Network Attached Storage NAS Enclosure Diskless White Home Cloud Backup is the only new-condition choice and explicitly names a two-bay, diskless configuration. QNAP offers two distinct used directions: the TS-451U is classified as a server and names its J1800 processor and 1GB RAM, while the TS-431P2 is explicitly a four-bay personal-cloud NAS with four caddies included.
Listed price comparison
| NAS option | Condition | Format or configuration clue | Listed price | Relative bar |
|---|---|---|---|---|
| Seagate BlackArmor NAS 400 series | Used | External Drive | USD 39.00 | |
| 2-Bay Network Attached Storage NAS Enclosure Diskless White Home Cloud Backup | New | 2-bay, diskless | USD 346.97 | |
| Qnap TS-451U | Used | 4-LFF, no HDD, Server | USD 249.99 | |
| Qnap TS-431P2 | Used | 4-bay personal cloud | USD 169.95 |
Decision matrix
- Choose the Seagate BlackArmor NAS 400 series when the lowest listed price and a used external-drive classification are the main priorities.
- Choose the 2-Bay Network Attached Storage NAS Enclosure Diskless White Home Cloud Backup for a new, explicitly diskless two-bay enclosure described for home cloud backup.
- Choose the Qnap TS-451U when a Server type plus the named J1800 2.41GHz CPU and 1GB RAM are central to the decision.
- Choose the Qnap TS-431P2 when an explicitly named four-bay personal-cloud NAS and four included caddies fit the plan.
Product notes
Seagate BlackArmor NAS 400 series
At the low end of the listed price range, the Seagate BlackArmor NAS 400 series offers a used NAS option classified as an External Drive. Choose it when a Seagate NAS 400-series unit is the desired starting point for centralized network storage; its description centers on data storage and management for a network. The trade-off is the used condition and external-drive type classification. The Seagate makes the clearest fit when the main priority is the range's lowest listed price rather than selecting an alternative identified by an explicit two-bay or four-bay format.
2-Bay Network Attached Storage NAS Enclosure Diskless White Home Cloud Backup
This white enclosure is the only entry marked new, and its title and features identify it as a two-bay, diskless NAS enclosure. It is a direct match for a home or small-team setup built around home cloud backup, with Android compatibility also listed. The description further positions the enclosure for connecting with multiple IP cameras for remote viewing. Its key limitation is in the product name: diskless means the enclosure does not include storage drives. Pick this route when a new two-bay enclosure is more relevant than the used Seagate external-drive format or either used QNAP option.
Qnap TS-451U 4-LFF J1800 2.41GHz CPU 1GB RAM No HDD Network Attached Storage NAS
The Qnap TS-451U suits shoppers who want named hardware identifiers to guide the selection: 4-LFF, a J1800 2.41GHz CPU, and 1GB RAM. Its Type is Server, making it appropriate for a decision centered on a server-classified NAS rather than a personal-cloud label. The title and description both state that no hard drive is included, which is the central component limitation. It is also used. Select the TS-451U when the named model and explicitly stated processor and memory details matter more than the new condition of the two-bay enclosure.
Qnap TS-431P2 Network Attached Storage NAS 4-Bay Personal Cloud
The Qnap TS-431P2 brings an explicitly named four-bay personal-cloud format. It is offered as a used unit with four caddies included, making it the relevant choice for a setup focused on the listed four-bay layout and caddies. The description also states that the power adapter and drives are not included, an important component consideration alongside its used condition. Choose the TS-431P2 when four-bay personal-cloud wording is more useful than the TS-451U's named CPU and RAM details or the new condition attached to the two-bay diskless enclosure.
Final recommendation by use case
- For the lowest listed-price NAS route, choose the Seagate BlackArmor NAS 400 series and its used External Drive classification.
- For a new two-bay diskless enclosure intended around home cloud backup, choose the 2-Bay Network Attached Storage NAS Enclosure Diskless White Home Cloud Backup.
- For a server-classified QNAP with named CPU and RAM, choose the Qnap TS-451U 4-LFF J1800 2.41GHz CPU 1GB RAM No HDD Network Attached Storage NAS.
- For an explicitly four-bay personal-cloud QNAP with four caddies, choose the Qnap TS-431P2 Network Attached Storage NAS 4-Bay Personal Cloud.
