The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →The right home NAS is determined less by its brand than by four linked decisions: how many drive bays you need, which RAID layout protects your data, whether your entire network can use the NAS’s link speed, and whether its software supports the backups and sharing tasks you actually perform. Size the system for usable capacity after RAID, leave room for growth, verify every drive against the exact model’s compatibility list, and build a separate off-site backup. A faster port or a larger enclosure cannot compensate for an unsuitable RAID plan, unsupported drives, or missing backup software.
Start with the job, not the enclosure
A network-attached storage (NAS) enclosure is a small computer that puts one or more internal drives on your home network. It can centralize documents, photos, computer backups and media, while allowing several users and devices to access the same files. The enclosure, drives, network and operating system work as one system, so choosing any one component in isolation can leave you with wasted capacity or an expensive bottleneck.
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Write down the tasks you expect to perform before comparing models:
- Shared folders for computers, phones and household users.
- Automatic backups of Windows, macOS, Linux or mobile devices, where the NAS software supports them.
- Photo organization and synchronization.
- Media storage and streaming to compatible players.
- Remote access when you are away from home.
- Continuous or scheduled video recording if you need surveillance features.
Then estimate the amount of data you will keep for the next three to five years. Include current files, phone-photo growth, computer images, version history and a safety margin. Advertised drive capacity is raw capacity; the amount available to files depends on the RAID layout, file-system overhead and any snapshots or reserved space.
#1 Best Overall
- Direct-attached storage device via USB Type-C for Windows, macOS and Linux
- Use the TR-004 as external storage for NAS backup
- Expand the capacity of your QNAP NAS
- 4 x 3.5-inch SATA 3Gb/s (Diskless)
- Hardware RAID supports RAID 0, 1, 5, JBOD, and individual disks
How many drive bays do you need?
A bay is a slot for an internal drive. Bay count sets the maximum number of drives you can install and therefore limits the RAID levels, usable capacity and expansion options available to you. A two-bay NAS can be compact and economical for a mirror or modest file share. A four-bay NAS costs more and requires more drives, but gives you more ways to balance capacity, redundancy and future growth.
| Decision | Two-bay enclosure | Four-bay enclosure |
|---|---|---|
| Typical starting use | Small household file share, or two-drive RAID 1 mirror | Larger shared storage, more users, or a plan that may use RAID 5, 6 or 10 |
| Drive flexibility | Usually limited to Single and RAID 1 on entry models; verify the exact specification | Often supports more layouts, but support still depends on the model and operating system |
| Growth headroom | Both bays may be occupied immediately, leaving no empty slot | One or more bays can be left empty for a later expansion, subject to the vendor’s expansion procedure |
| Cost and complexity | Lower enclosure and drive cost, simpler setup | Higher initial cost, more drives to buy and monitor |
QNAP’s beginner comparison uses the TS-264 as a two-bay example and the TS-464 as a four-bay example. In that vendor comparison, the TS-264 lists Single and RAID 1, while the TS-464 lists Single, RAID 1, RAID 5, RAID 6 and RAID 10. QNAP recommends the four-bay model when a user wants more storage or more RAID choices. That is vendor guidance for those models, not an independent test or a universal rule.
Calculate usable capacity before buying drives
Use the smallest drive in an array as the conservative basis for planning. If you install four nominal 12 TB drives in RAID 5, the simple planning estimate is roughly three drive-equivalents (about 36 TB before formatting and reserved space). In RAID 6, the estimate is roughly two drive-equivalents (about 24 TB). A two-drive RAID 1 mirror provides about one drive-equivalent, so two 12 TB drives yield roughly 12 TB before overhead.
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Manufacturers label drives in decimal terabytes, while operating systems display capacity differently, and NAS features may reserve space. Treat these calculations as planning estimates, not guaranteed free space. Check the model’s calculator or documentation for the exact result.
Leave room for growth deliberately
If your estimate fills every bay on day one, expansion may require replacing drives one at a time and waiting for a rebuild, or migrating to a larger array. The procedure, supported drive sizes and RAID expansion rules vary by model. A four-bay enclosure with one empty slot can be easier to grow than a fully populated two-bay unit, but an empty bay is not itself a backup and does not increase current usable capacity.
Choose RAID for the failure you expect
RAID combines drives to provide capacity, redundancy, performance or a mixture of those goals. Synology describes the choice as a trade-off among usable capacity, data protection and performance. The exact modes and drive-count requirements depend on the NAS model, so confirm them in the product specification before purchasing.
| Layout | Planning capacity with equal-size drives | What a single-drive failure means | Trade-off |
|---|---|---|---|
| Single (no RAID) | Approximately the sum of the drives, if the system presents them as separate storage | Only the failed drive’s data is affected; there is no array redundancy | Maximum raw capacity, but you must rely on backups for recovery |
| RAID 1 | Approximately one drive-equivalent in a two-drive mirror | The mirror can continue operating after one drive fails | Half of the raw capacity is used for the copy |
| RAID 5 | Approximately (number of drives minus one) drive-equivalents | Designed to tolerate one failed drive while the array is rebuilt | Good capacity efficiency, but rebuilds consume time and performance |
| RAID 6 | Approximately (number of drives minus two) drive-equivalents | Designed to tolerate two failed drives | More protection, with two drive-equivalents devoted to parity |
| RAID 10 | Approximately half of the raw capacity | Can tolerate failures in separate mirror pairs; two failures in one pair can stop the array | Mirroring plus striping, requiring at least four drives on many systems |
The table describes common behavior, not a promise that every NAS offers every layout. Some systems use vendor-specific names or impose minimum drive counts. Read the exact model’s supported-RAID list and its documented failure scenarios.
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After a failed drive is replaced, the NAS must reconstruct missing mirror or parity information. During that period the array is degraded: performance may fall, and another failure can create a much more serious outage. Larger drives take longer to rebuild, and the actual duration depends on workload, array size and the enclosure. Keep a tested backup available before starting a replacement or expansion.
Rank #2
- 【Reliable External Storage System for Individuals and Business】The 4 Bay Hard Drive Enclosure supports 2.5/3.5 inches HDD and SSD, max capacity up to 80TB( 20TB for each hard drive), it's a ideal external hard drive enclosure for personal or enterprise using.Save space on your desktop or laptop.
- 【No heat】The 4 bay hard drive reader built in Aluminum-Alloy materials and 2 inch Fan.Maximize the security of your data.NOTE：Fan noise is around 40-50 decibels, not recommended if you are very sensitive to noise.
- 【Up to 5Gbps】This 4 bay enclosure equips with advanced chip and USB 3.0 output interface, Max 5Gbps under UASP control.Transfer 1G movie in 3-5 seconds with USB 3.0 Ports, which is 10 times faster than USB 2.0.
- 【Wide Compatibility, Plug and Play】Equipped with USB A/C 3.0 Cable Cable.Compatible with Windows 7 and above, Mac 9.1 and above, Linux.Plug and play, no fuss, no muss.
- 【Stable power supply】Equipped with DC 12V power adapter to provide stability for high-speed transmission.
RAID is not a backup
RAID helps keep storage available when a supported drive fails. It does not create an independent historical copy. Accidental deletion, overwritten files, ransomware, a stolen NAS, fire, flood or a power event affecting the whole house can remove the original and every RAID member together.
Build a real backup plan with 3-2-1
Synology’s published guidance states: “3 Have at least 3 copies of your data. 2 Keep these copies on 2 different mediums. 1 Store at least 1 copy off-site.” The same guidance warns that local backups do not protect against fire, natural disaster or theft of all equipment. An off-site copy is therefore a core part of a home NAS plan, not an optional feature reserved for businesses.
A practical home arrangement
- Primary copy: files in the NAS volume.
- Local second copy: a separate USB drive, another NAS or another device that is not part of the same RAID array.
- Off-site third copy: a copy stored at another location or with an off-site storage provider. Choose a service and retention period that fit your privacy, bandwidth and budget requirements.
Automate schedules, retain multiple versions and encrypt copies when the software allows it. A backup is only useful if it can be restored, so periodically recover a sample folder and record the steps needed to rebuild the NAS.
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Separate backup frequency from RAID choice
RAID level determines how the NAS responds to drive failure; backup frequency determines how much work you lose after deletion or corruption. A household that edits photos daily may need frequent versioned backups even if its array has dual-drive fault tolerance. Conversely, a rarely changed archive may use a less frequent schedule but still needs an off-site copy.
Buy drives that the exact NAS supports
Drive compatibility is model-specific. Before ordering, open the current compatibility list for the precise enclosure, not merely the manufacturer’s general drive page. Check the drive interface, form factor, capacity, firmware notes and any restrictions on mixing models.
Synology’s DS423+ compatibility page, for example, lists third-party NAS-class 3.5-inch SATA hard-drive examples, including capacities from the IronWolf family. Synology also warns that drives outside its list may receive limited support and that the list can change. Treat an unlisted disk as a risk: it may work, but the vendor may not provide the same diagnostics, firmware guidance or warranty assistance.
NAS-rated hard drives versus desktop drives
NAS-rated hard drives are designed for multi-drive enclosures and continuous workloads, but “NAS-rated” does not override the compatibility list. A supported desktop-class drive may be acceptable for a particular model, while an unsupported NAS-class drive may not be. Confirm the exact model number and capacity suffix, because two drives sold under a similar family name can have different firmware or recording technology.
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Plan replacements as well as the first purchase
Record the drive model, capacity, serial number and installation date. Keep at least one replacement strategy: a spare drive that appears on the compatibility list, or a way to obtain an approved model quickly. Never remove a healthy drive merely to test a replacement process; use the NAS’s documented procedure and verify the backup first.
Rank #3
- High-Speed Data Transmission: The D4-320 hard drive enclosure (a DAS, NOT a NAS) utilizes the USB 3.2 Gen2 protocol, achieving high-speed data transmission of up to 10Gbps. When equipped with four hard drives, the actual read/write speed can reach up to 1,016 MB/s (combined read/write with four SATA III HDDs of 8TB each). With just one SSD installed, the read speed effortlessly reaches 510 MB/s (SATA III 1TB SSD). The D4-320 supports a single HDD up to 30TB, with a total capacity of 120TB, and is compatible with various hard drives, including 3.5-inch SATA hard drives, 2.5-inch SATA hard drives, and 2.5-inch SATA SSDs
- Plug-and-Play Compatibility: The D4-320 USB storage supports 4 individual disks (NO RAID function), and is plug-and-play, eliminating the need for drivers. It is highly compatible with MAC, Windows, and Linux operating systems. The USB Type-C interface supports various computer interfaces, including USB 3.0, USB 3.1, USB 3.2, Thunderbolt 3, and Thunderbolt 4
- Hot Swappable Convenience: The D4-320 HDD enclosure supports hot swapping, allowing users to replace hard disks without powering off the device. This feature enhances convenience and efficiency in data transfer processes
- Tool-Free Hard Drive Management: Featuring a tool-free hard drive tray design, the D4-320 external HDD enclosure enables easy installation and removal of hard drives without requiring additional tools. Furthermore, the D4-320 incorporates TerraMaster's unique Push-lock design, automatically securing the hard drive tray upon insertion, preventing the hard drive from falling out or disconnecting
- Efficient Heat Dissipation and Quieter Operation: The D4-320 direct attached storage incorporates an intelligent temperature-controlled fan for optimal heat dissipation. Additionally, specialized sound-absorbing panels and vibration damping measures contribute to a quieter operation, with noise levels reduced by up to 50% compared to the previous generation. In standby mode, the noise level drops below 21 dB(A), creating a remarkably quiet user environment
Match NAS networking to the whole path
A NAS port’s nominal speed is only one link in a chain. The NAS interface, router or switch, Ethernet cabling, client adapter and the client’s storage must all support the faster rate. QNAP lists 2.5GbE NAS systems and related network expansion cards and switches, which shows that upgrade paths exist; it does not guarantee a particular household transfer speed.
| Path element | Question to answer | Typical failure when ignored |
|---|---|---|
| NAS port | Is it 1GbE, 2.5GbE or faster, and can the model use link aggregation or expansion? | The NAS itself limits every transfer |
| Switch or router | Does the device have a matching port, and are all relevant ports enabled at that speed? | A faster NAS is negotiated down to the slower network |
| Cabling | Is the installed cable suitable for the target speed and length? | Unstable links, errors or fallback to a lower rate |
| Client adapter | Does the computer have a compatible Ethernet or Wi-Fi adapter? | Only one workstation benefits, or none do |
| Client storage and workload | Can the computer’s SSD, hard drive and file workload process data that quickly? | Small files, encryption or a slow disk hide the network improvement |
For scale, 1 gigabit per second is 125 megabytes per second before protocol overhead, and 2.5 gigabits per second is 312.5 megabytes per second before overhead. Real transfers are lower and vary with file size, RAID processing, encryption, client storage and simultaneous users. Do not treat those arithmetic limits as a benchmark.
When 2.5GbE is worth considering
A 2.5GbE upgrade is most useful when several users move large files, when a workstation regularly edits media from the NAS, or when you are building a new switch and cabling plan. If every client, the router and the switch remain 1GbE, paying for a 2.5GbE NAS port will not make those clients faster. Wireless clients also depend on radio conditions and access-point capacity, so a wired test is the clearest way to evaluate the NAS link.
Compare the software ecosystem, not just hardware
The operating system and its packages determine whether the NAS is convenient after installation. Compare the functions you will use, and confirm that they are supported by the exact model and current operating-system version.
Backup and synchronization
Look for computer backup agents, mobile-device backup, scheduled jobs, version history, encryption and a restore workflow. QNAP’s beginner guidance covers system initialization, user folders, cloud-storage connections and computer or mobile backups. Those are practical capabilities to verify in the model’s current documentation rather than assuming every enclosure includes them.
File sharing and permissions
Check support for the protocols your devices use, such as SMB for common desktop file sharing, and examine user, group and shared-folder permissions. Confirm whether the system can apply quotas, audit activity and isolate a private folder from a household-wide share. A fast NAS with an awkward permission model can create more support work than a slower system that matches your family’s devices.
Photos and media
Photo applications should handle phone uploads, albums, search and versioning in a way your household understands. Media features should be checked against the formats and playback devices you own; “media server” does not guarantee that the NAS will transcode every file. Synology’s DSM 7.3 specification lists Synology Drive, Hyper Backup, Synology Photos and Media Server among its examples, with package support dependent on system compatibility.
Surveillance and specialist applications
If you plan to record cameras, verify camera compatibility, the number of supported streams, retention settings and whether licenses or model restrictions apply. Synology’s DSM 7.3 specification includes Surveillance Station as an example, but the presence of a package does not establish identical support across all models. Check CPU, memory and package requirements before using surveillance as a reason to buy a particular enclosure.
Rank #4
- Pro-Performance NAS Engineered for Demanding Workflows: This NAS is built for offices, businesses, and power users who need serious performance. Powered by a pro-performance Intel processor, it serves as a versatile private workstation that delivers smooth performance for running virtual machines and Docker containers. It functions as an IT hub for video editors, developers, virtualization tasks, and growing teams with advanced workflows
- Pro-Grade Core Hardware Performance: Features the Intel Core i3-1315U Processor (6 Cores, 8 Threads, up to 4.5GHz Turbo), offering a significant performance lead. It's paired with 8GB of high-speed DDR5 RAM (expandable to 96GB) and 13th Gen Intel UHD Graphics for smooth multitasking. Dual high-speed network ports (10GbE + 2.5GbE) enable blazing-fast transfers, reaching up to 1.25GB/s
- Ultimate Flexibility with Docker, VMs & Smart AI: It offers comprehensive support for Docker and Virtual Machines, unlocking endless possibilities to run personal websites, smart home hubs, or private development environments. The local AI-powered Photo Album automatically recognizes faces, scenes, and content. All AI processing happens on-device, ensuring your privacy while managing massive photo libraries effortlessly
- Massive Storage & Intuitive All-in-One System: It supports a colossal 144TB capacity (4x HDD + 2x M.2 SSD), enough for approximately 4.2 million 35MB RAW photos, 3.6K 40GB 4K movies, 5 million 30MB lossless music, or 150 million 1MB files. Dual M.2 PCIe 4.0 SSD slots can be used as a high-speed cache or storage pool to eliminate HDD bottlenecks. The intuitive UGOS Pro operating system integrates a media center, photo management, cloud sync, downloads, and more for a one-stop experience
- Enterprise-Grade Data Security & Privacy: Provides multiple RAID configuration options (0, 1, 5, 10) for flexibility between capacity, speed, and protection. Features granular user permission controls (supporting up to 2048 accounts). The Data Vault offers an extra layer of security by hiding and encrypting sensitive files. Certified for strong privacy and data protection by TV SD (ETSI EN 303 645) and TRUSTe
Updates, remote access and security controls
Check how the system delivers operating-system and package updates, whether it can require multi-factor authentication, and how it exposes services remotely. Disable services you do not need, use individual accounts rather than a shared administrator login, and keep an offline recovery method for the administrator account. Remote access should be enabled only after local sharing and backups work reliably.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A step-by-step buying process
- Inventory your data. Measure current folders, estimate annual growth and identify which data is irreplaceable.
- Set a usable-capacity target. Apply the planned RAID layout and reserve headroom; do not compare enclosures by raw bay count alone.
- Select bay count. Choose two bays for a simpler, smaller plan or four bays when you need more layouts, capacity or expansion room.
- List acceptable RAID modes. Confirm the exact model supports the mode and drive count you intend to use, including its documented failure tolerance.
- Check drive compatibility. Match exact drive model numbers and capacities against the current vendor list, and note support limitations for unlisted drives.
- Map the network. Record NAS, switch, router, cabling and client-link speeds. Upgrade the slowest essential component before paying for a faster NAS port.
- Audit the software. Confirm backup, file-sharing, photo, media, remote-access and surveillance features for the model and current operating-system release.
- Budget the complete system. Include the enclosure, all drives, a replacement plan, a UPS if appropriate, network hardware, and recurring off-site backup storage.
- Read the recovery documentation. Make sure you understand drive replacement, RAID expansion, administrator recovery and restore procedures before installation.
Set up the NAS without creating future problems
- Install approved drives. Record each model and serial number, then seat drives according to the enclosure’s instructions.
- Initialize the operating system. Apply current firmware and packages, set a unique administrator credential and enable available security protections.
- Create the storage pool and volume. Select the intended RAID layout only after checking the usable-capacity estimate and rebuild implications.
- Create users and shared folders. Give each person an individual account, apply least-privilege permissions and separate private data from common folders.
- Connect clients locally first. Test file creation, deletion, large-file copying and phone uploads before enabling remote access.
- Configure backups. Set computer and mobile schedules, create a separate local destination and establish the off-site copy with retention and encryption settings.
- Test restoration. Restore several files, a folder and—if practical—a complete device image. Document what worked and where recovery keys are stored.
- Monitor health. Enable drive-health alerts, capacity warnings and failed-backup notifications. Review them rather than assuming a silent system is a healthy one.
Common buying mistakes and how to avoid them
Buying for raw terabytes
Adding the printed capacities of the drives ignores RAID overhead and reserved space. Convert your target to usable capacity first, then add growth headroom.
Assuming every four-bay NAS supports the same RAID
Bay count suggests possibilities, not a guarantee. The QNAP TS-264 and TS-464 comparison demonstrates that even closely related models can expose different layouts. Read the exact specification.
Treating mirroring as disaster recovery
A mirrored pair can preserve availability after one drive fails, but it mirrors deletions and can be lost with the NAS in a fire or theft. Keep separate local and off-site copies.
Mixing drives without checking support
Similar names do not prove identical firmware or compatibility. Use the current list for the exact enclosure and retain the vendor’s support notes.
Paying for 2.5GbE without upgrading the path
A 2.5GbE port connected to a 1GbE switch and 1GbE clients behaves like a 1GbE system. Map every link before buying adapters or switches.
Choosing applications by name alone
A package label such as “photo” or “backup” does not tell you whether it supports your devices, retention rules or restore needs. Verify model compatibility and perform a trial restore.
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The NAS reports a degraded array
- Identify the failed drive from the management interface and confirm the serial number before removing anything.
- Check that the replacement appears on the current compatibility list and is at least the required capacity.
- Follow the documented replacement process, start the rebuild, and avoid unnecessary heavy workloads until it completes.
- Check the separate backup before and after the rebuild; RAID recovery is not a substitute for restoring a damaged file.
Transfers are slower than expected
- Check negotiated link speed on the NAS, switch and client rather than relying on port labels.
- Test a large file and a folder of small files; small-file workloads have more protocol overhead.
- Look for a slow client disk, high CPU use, encryption, a rebuilding array or simultaneous users.
- Replace or reconfigure the slowest network component before concluding that the NAS is defective.
A drive is flagged as unsupported
- Verify the complete model number and firmware against the vendor’s current list.
- Read the stated support limitation; an unlisted drive may function but receive limited assistance.
- Do not remove a healthy supported drive solely to experiment. Resolve the compatibility question before expanding the array.
A backup job says it succeeded but files are missing
- Open the destination directly and inspect the backup set, versions and retention policy.
- Run a manual restore of known files and compare them with the originals.
- Check whether the job excludes folders, follows symbolic links or requires an application-specific restore tool.
- Keep a second destination until the restore process is proven.
Questions to settle before you order
- How much usable space do I need after RAID and reserved capacity?
- What is my acceptable drive-failure scenario, and does this model’s RAID support it?
- Where is the off-site copy, and how often will it update?
- Which exact drives are approved for this enclosure today?
- Can my switch, router, cabling and clients use the NAS’s advertised network speed?
- Do the current software packages support my computers, phones, photos, media formats and cameras?
- Can I demonstrate a restore before I trust the NAS with irreplaceable files?
Bottom line
Buy the NAS that fits a documented capacity and recovery plan. Choose bays for both today’s usable space and tomorrow’s growth, select RAID for its specific failure tolerance, verify every drive against the exact model list, and treat networking as an end-to-end path. Then install the software that matches your devices and maintain a tested 3-2-1 backup with at least one off-site copy. Those decisions matter more than a headline port speed or the largest raw-terabyte number on the box.
Quick Recap
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