When your internal drives fill up, you face a fork in the road: attach more storage directly to one computer with a DAS, or put it on the network with a NAS so every device can reach it. Both hold your files on external drives, but they suit very different needs. This guide breaks down the tradeoffs so you pick the right one the first time instead of buying twice.
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Our Top Picks
Synology DS225+ Private Cloud Media ServerDS225+ (Diskless)9.14 x 4.25 x 6.5 inches2.9 PoundsCheck on Amazon
Synology DS725+ Expandable NAS Storage166 mm x 106 mm x 223 mm8.78 x 4.17 x 6.54 inches3.3 PoundsCheck on Amazon
Top 3 picks at a glance
What each one is
DAS stands for Direct Attached Storage: an enclosure of one or more drives that connects to a single PC over USB, USB4, or Thunderbolt. It behaves like a big internal drive. NAS stands for Network Attached Storage: a small always-on box with its own processor and network port that serves files to any device over your home network, and often the internet.
| Factor | DAS | NAS |
|---|---|---|
| Connection | USB / Thunderbolt to one PC | Network, all devices |
| Speed | Very fast (up to ~40 Gbps) | Limited by network (~1-10 Gbps) |
| Multi-user access | No | Yes |
| Always on | Only with the PC | Yes, standalone |
| Apps (backup, media, sync) | No | Yes |
| Cost and complexity | Lower, simpler | Higher, more setup |
When DAS is the right call
Choose DAS when raw speed to one machine matters most and only that machine needs the files. Video editors scrubbing 4K footage, photographers with huge libraries, and anyone needing scratch or working storage benefit from Thunderbolt or USB4 DAS hitting speeds a network cannot match. It is also cheaper, simpler, and has nothing to configure beyond plugging it in.
DAS limitations
A DAS is tied to whatever it is plugged into. Unplug it or turn off the PC and the files are gone from the network. There is no built-in remote access, no scheduled backup engine, and no media streaming to other rooms unless the host PC provides it.
When NAS wins
Choose NAS when multiple people or devices need the same files, when you want an always-on media server, or when you want automated backups from several computers to one central place. A NAS runs apps for photo backup from phones, Plex or Jellyfin media streaming, file sync, and remote access. It is a small server, and that flexibility is its whole point.
NAS tradeoffs
Network speed caps transfer rates. Standard gigabit Ethernet tops out around 110 MB/s, far slower than Thunderbolt DAS, though 2.5GbE and 10GbE NAS units narrow the gap for a price. A NAS also costs more up front and requires initial setup, RAID configuration, and ongoing maintenance like firmware updates.
Can you have both?
Many people do. A Thunderbolt DAS handles fast working storage on the main editing PC, while a NAS handles centralized backup, archives, and media for the household. The two roles complement each other, and a NAS can even back itself up to an attached DAS.
Matching the choice to real scenarios
A few common situations make the decision concrete. A solo video editor working from one powerful desktop who needs the fastest possible scratch and project storage should choose a Thunderbolt or USB4 DAS, because network speeds would bottleneck 4K and 8K workflows. A household with several laptops, phones, and a smart TV that wants centralized photo backup, movie streaming to any room, and automatic backups from every device should choose a NAS, since only an always-on networked box serves everyone at once. A photographer who travels light might carry a rugged portable SSD (a form of DAS) in the field and dump everything to a NAS at home for long-term storage and backup. Someone on a tight budget who just needs more space for one PC will find a DAS cheaper and simpler. Notice how each answer flows from two questions: how many devices need the files, and how much does peak speed matter. Answer those honestly and the right tool becomes obvious, which is far cheaper than buying the wrong one and replacing it.
FAQ
Is a NAS just a slower DAS?
No. A NAS trades peak speed for network access, always-on availability, multi-user support, and apps. A DAS trades all of that for simplicity and much higher speed to one machine. They solve different problems, so the better choice depends entirely on how you work.
Which is better for backups?
A NAS is generally better for automated, multi-device backups because it is always on and runs backup software centrally. A DAS works for backups too, but only when connected, so it suits a single machine or an offline archive rotation.
Bottom line
Pick DAS for maximum speed to one computer with minimal fuss, ideal for editing and working storage. Pick NAS for shared, always-on access, media streaming, and automated backups across your whole home. Neither is universally better; match the tool to the job, and if your needs span both, running one of each is a common and effective setup.
