What Is a NAS and Does Your Office Need One
Basics4 minInnovialabs editorial team
In short
A NAS is a small server with drives that plugs into the office network and shares files with everyone; you need one when the cloud falls short on speed, capacity or control over your data.
The short answer
NAS (Network Attached Storage) is a compact computer with one or more drives, connected to your local network by cable. Employees see it as a shared folder, and an administrator manages it through a web interface.
A NAS runs its own operating system, so it does more than store files: it manages access rights, runs backups, syncs with the cloud and can record IP camera footage.
NAS vs external drive vs cloud
| External drive | NAS | Cloud storage | |
|---|---|---|---|
| Who can use it | One computer | Everyone on the local network | Anyone with internet |
| Speed in the office | Fast, but for one person | Fast, limited by the network | Depends on your internet link |
| Access rights | None | Users, groups, folders | Yes, flexible |
| Drive failure protection | None | Yes, with RAID on 2+ drives | Handled by the provider |
| Costs | One-time purchase | Device + drives + upkeep | Ongoing subscription |
| Works without internet | Yes | Yes, inside the office | No |
An external drive is a personal tool. Once several people work with the same files, it becomes "the drive everyone is looking for".
Cloud storage is great for remote work and needs no hardware, but every file travels over your internet connection, and the bill grows with data volume and user count.
A NAS sits in between: the data is physically yours, access inside the office is fast, and remote staff can reach it over a VPN.
What offices use a NAS for
- Shared files. Department folders with permissions: accounting sees its files, sales sees theirs.
- Backups of computers and servers. A NAS is a convenient target for scheduled automatic backups.
- Video surveillance. Many models can act as a recorder for IP cameras.
- Large files. Video, design projects, drawings, photo archives — things that are slow to push through the cloud.
- File versions and snapshots. Roll a folder back to yesterday after a mistake or a ransomware attack.
- Hybrid with the cloud. The NAS keeps working data locally and syncs it, or a copy of it, to cloud storage.
Signs you have outgrown cloud-only storage
- Large files take a long time to open and save, and people complain about syncing.
- Your internet link is saturated by uploads, hurting calls and other services.
- When the internet goes down, the office effectively stops working with documents.
- Subscription costs grow faster than the data you actually need.
- You must keep certain data on your own hardware or under your direct control.
- You need to store camera footage archives, which are awkward and expensive to keep in the cloud.
If none of this applies, a NAS may be unnecessary: a small team working with documents and spreadsheets is often fine with the cloud alone.
What to look for when choosing
- Number of drive bays. For an office, two is a sensible minimum so you can mirror the drives (RAID 1).
- NAS-rated drives. Choose drives designed for 24/7 operation, not standard desktop models.
- Network ports. If you move many large files, look for support for speeds above 1 Gbps.
- Software features. Snapshots, cloud backup, user management, camera support and regular security updates from the vendor.
- UPS. Connect the NAS to an uninterruptible power supply so a sudden power cut does not damage data.
Common mistakes
- Treating RAID as a backup. RAID protects against a drive failure, not against deleted files, fire or ransomware. Keep a separate copy outside the NAS.
- Exposing the NAS directly to the internet. The web interface and shares should be reachable from outside only through a VPN.
- Skipping firmware updates. NAS devices are a frequent attack target, so security updates matter.
- One shared login for everyone. Then you cannot separate access or find out who deleted what.