RAID, NAS, or DAS: what creators actually need for backup
Understand direct-attached storage, network-attached storage, common RAID layouts, usable capacity, and why redundancy is not a complete backup plan.
1. DAS and NAS describe how storage connects
Direct-attached storage connects to a computer through a local interface such as USB or Thunderbolt. It is usually the simplest path to high performance for one editing workstation. Network-attached storage connects through Ethernet or Wi-Fi and can serve several computers, automate shared tasks, and remain available without the editing computer.
Neither term guarantees redundancy. A DAS may contain one disk or a multi-disk RAID, and the same is true of a NAS. Start with the access pattern: one workstation and travel, or several devices and centralized management.
| Term | What it describes | What it does not guarantee |
|---|---|---|
| DAS | Storage directly connected to a computer | Redundancy, sharing, or backup |
| NAS | Storage accessed over a network | Offsite protection or historical versions |
| RAID | How data is arranged across multiple drives | An independent backup |
2. Understand the common RAID tradeoffs
RAID 0 stripes data for capacity and performance but provides no disk-failure protection; losing one member can lose the array. RAID 1 mirrors data and can keep working after one member fails in a two-drive mirror, at the cost of half the raw capacity. Parity layouts such as RAID 5 or RAID 6 trade capacity and write overhead for tolerance of one or more disk failures, depending on the level and implementation.
A rebuild is a recovery operation, not a routine maintenance event. Performance can fall and another problem can occur during the rebuild. Keep the independent backup current before replacing a failed disk or changing an array.
3. RAID improves availability, not historical recovery
Redundancy can let work continue when a drive fails, but every member of an array reflects the current state. If a folder is deleted, a project is overwritten, malware encrypts files, or the enclosure is stolen, RAID does not provide the missing earlier copy.
Use snapshots or versioned backup software for earlier states, then replicate important data outside the array and outside the location. Understand snapshot retention and confirm that the snapshot itself is not the only recovery path.
4. Calculate usable capacity and the real bottleneck
Raw capacity is not usable capacity. Mirroring and parity consume space, the file system adds overhead, and manufacturers state decimal capacity. Budget free space for versioning, snapshots, growth, and a rebuild rather than planning to fill the system completely.
For DAS, the host port and enclosure can limit performance. For NAS, the network path, switch, cabling, client adapter, protocol, and number of simultaneous users matter. Faster disks will not overcome a slower network link.
5. Pick the smallest system that solves the workflow
A single editor may be best served by a fast DAS plus an automatic backup disk and offsite copy. A studio with several workstations may benefit from a NAS for shared originals, proxy generation, centralized permissions, and scheduled backups. Complexity adds administration, so include monitoring, software updates, alerts, spare-drive planning, and restore tests in the cost.
Apple supports Time Machine backups to compatible NAS devices, showing how a NAS can serve as one backup destination. It still remains local unless another copy is replicated offsite. Map the design to the 3-2-1 rule before buying bays and drives.
Frequently asked questions
Is RAID a backup?
No. RAID can provide availability or performance within one system, but it does not create an independent historical or offsite copy.
Should a photographer buy a NAS or DAS?
Choose DAS for simpler high-speed access from one workstation. Choose NAS when multiple devices, shared access, centralized automation, or remote administration justify the added complexity.
Which RAID level is best for video editing?
There is no universal level. It depends on performance, usable capacity, failure tolerance, enclosure design, backup plan, and how much downtime is acceptable. RAID 0 should never hold the only copy.
Primary references
Technical standards can change. We use the relevant standards organizations as primary references and recommend checking the device maker's current manual.