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Choose direct-attached storage (DAS) when one computer needs extra storage or a simple local backup. Choose network-attached storage (NAS) when several devices or people need shared files or centrally managed backup workflows. Either can hold a backup, but neither RAID nor a single storage device is a complete backup plan: keep another copy, preferably on a separate medium and in an offsite or otherwise separately protected location.
What’s the difference between NAS and DAS?
Direct-attached storage (DAS)
DAS connects directly to a computer, commonly through an external USB drive. By itself, a DAS drive is attached to its host; other computers on the network do not connect directly to it. To make its files available over a network, the connected computer or a NAS must share or host the drive, and that host must be available and configured to do so. WD describes this direct-connection distinction in its support guidance.
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Network-attached storage (NAS)
A NAS connects to the network and makes storage available to devices through network services. Depending on the model and configuration, it may offer shared folders, user permissions, backup applications, snapshots, and remote-access options. Protocol support varies; Synology’s DSM guidance, for example, documents services including SMB, NFS, FTP, and WebDAV. Check the selected NAS model and software version for supported features.
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| Need | Likely fit | What to check |
|---|---|---|
| Extra space for one desktop or laptop | DAS | Computer ports, drive format, and capacity. A direct connection is usually the simpler arrangement. |
| A copy of one computer’s files | DAS or NAS | Whether you want manual copying or scheduled and versioned backups; check backup software support and restore steps. |
| Shared folders for household devices or a small team | NAS | Client compatibility, network protocols, permissions, network performance, and whether remote access is supported and configured. |
| Backups from several devices in one place | NAS | Support for each client device, backup scheduling, version history, snapshots, and any separate offsite copy you need. |
| A separate recovery copy | Either can be the destination | A USB DAS drive can serve as a backup destination on supported NAS systems. Follow the device instructions and eject safely before unplugging; consider disconnecting or separately locating backup media when appropriate. |
For a one-computer setup, an external USB drive is a straightforward DAS option. For shared storage and centralized workflows, a NAS enclosure is the relevant category; check drive bays, supported drives, backup-client support, network ports, software support lifetime, security updates, and remote-access design before choosing a model. If the enclosure takes separately installed drives, confirm compatibility against its supported-drive list.
#1 Best Overall
- 【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.
Can other computers access a DAS drive?
Not directly just because the drive is plugged into one computer. Network access requires that the connected computer or another suitable host share the drive. That host needs to be on and correctly configured while other devices need access. A NAS is designed to provide storage over the network without relying on a user’s desktop or laptop as the sharing host.
Is NAS RAID a backup?
No. RAID can provide redundancy or help maintain availability after some disk failures, depending on its implementation, but it does not protect against every cause of data loss. A NAS can fail, lose disks, or be misconfigured, so it should not be the only copy of important files. Synology’s backup guidance recommends the 3-2-1 approach: 3 copies, 2 storage mediums, and 1 offsite copy. It also warns that RAID crashes and hard-drive failures may still cause data loss. Read Synology’s data-protection guidance.
Rank #2
- Secure private cloud - Enjoy 100% data ownership and multi-platform access from anywhere
- Easy sharing and syncing - Safely access and share files and media from anywhere, and keep clients, colleagues and collaborators on the same page
- Automated Backup Protection - Set-and-forget backups for Macs, PCs and mobile devices to multiple destinations including cloud and external drives
- Home Security System - Record and monitor your property 24/7 with support for multiple IP cameras and remote viewing
- 2-Year Warranty - Reliable hardware backed by Synology's expert customer support team and ongoing software updates
NAS backup features vary by system and use case. Synology lists Hyper Backup, Snapshot Replication, Active Backup for Business, USB Copy, and Cloud Sync among its data-protection approaches; confirm availability and scope for the device and workflow you plan to use.
How should you compare speed, capacity, cost, and upkeep?
- Access: One host generally favors DAS. Shared access by multiple devices or people favors NAS.
- Backup workflow: Compare manual copying with scheduled automation, version history, client compatibility, and the steps needed to restore files.
- Capacity and expansion: Compare usable capacity, drive bays, supported drive sizes, and expansion options for specific products.
- Speed: Consider the drive, enclosure, host interface, Ethernet or Wi-Fi connection, and workload. Neither category is universally faster; the result depends on the hardware and setup.
- Total cost and maintenance: Account for the enclosure, drives, network upgrades if needed, power, separate backup media, software, and the time required to manage the setup. There is no established like-for-like price comparison here.
Using a USB drive as a NAS backup target
Some NAS systems support a directly connected USB drive as a backup destination. This can create a separate copy, but the steps and compatibility are device-specific. Seagate’s NAS manual documents this workflow for its system and warns users to eject the drive before disconnecting it to avoid filesystem damage. Follow the instructions for your own NAS rather than assuming every model behaves the same way. See Seagate’s NAS manual.
Quick Recap
Best Value
- Entry-level NAS Personal Storage：UGREEN NAS DH2300 is your first and best NAS made easy. It is designed for beginners who want a simple, private way to store videos, photos and personal files, which is intuitive for users moving from cloud storage or external drives and move away from scattered date across devices. This entry-level NAS 2-bay perfect for personal entertainment, photo storage, and easy data backup (doesn't support Docker or virtual machines).
- Set Your Devices Free, Expand Your Digital World: This unified storage hub supports massive capacity up to 64TB.*Storage drives not included. Stop Deleting, Start Storing. You can store 22 million 3MB images, or 2 million 30MB songs, or 43K 1.5GB movies or 67 million 1MB documents! UGREEN NAS is a better way to free up storage across all your devices such as phones, computers, tablets and also does automatic backups across devices regardless of the operating system—Window, iOS, Android or macOS.
- The Smarter Long-term Way to Store: Unlike cloud storage with recurring monthly fees, a UGREEN NAS enclosure requires only a one-time purchase for long-term use. For example, you only need to pay $459.98 for a NAS, while for cloud storage, you need to pay $719.88 per year, $2,159.64 for 3 years, $3,599.40 for 5 years. You will save $6,738.82 over 10 years with UGREEN NAS! *NAS cost based on DH2300 + 12TB HDD; cloud cost based on 12TB plan (e.g. $59.99/month).
- Blazing Speed, Minimal Power: Equipped with a high-performance processor, 1GbE port, and 4GB RAM on Board, this NAS handles multiple tasks with ease. File transfers reach up to 125MB/s—a 1GB file takes only 8 seconds. Don't let slow clouds hold you back; they often need over 100 seconds for the same task. The difference is clear.
- Let AI Better Organize Your Memories: UGREEN NAS uses AI to tag faces, locations, texts, and objects—so you can effortlessly find any photo by searching for who or what's in it in seconds. It also automatically finds and deletes similar or duplicate photo, backs up live photos and allows you to share them with your friends or family with just one tap. Everything stays effortlessly organized, powered by intelligent tagging and recognition.
Rank #4
- 【Reliable External Storage System for Individuals and business】The 3.5 hard drive enclosure supports 2.5/3.5 inches HDD and SSD, max capacity up to 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 sata enclosure built in Aluminum-Alloy materials and 2 inch Fan.Maximize the security of your data.Fan noise is around 40-50 decibels, not recommended if you are very sensitive to noise.
- 【Up to 5Gbps】This dual bay enclosure equips with advanced chips and USB 3.0 output interface.Transfer 1G files in 3-5 seconds with USB 3.0 Ports, which is 10 times faster than USB 2.0.
- 【Hot Swappable Convenience】The HDD enclosure supports hot swapping, allowing users to replace hard drives without powering off the device. This feature enhances convenience and efficiency in data transfer processes.
- 【Tool-Free Installation】Featuring a tool-free hard drive tray design, the external hard drive enclosure enables easy installation and removal of hard drives without requiring additional tools. Plug and play! No fuss, no muss!
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
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