What Is a NAS and Do You Actually Need One?
A NAS is a private cloud you control. Here's when it makes sense, what it costs, and how to pick your first one.
What a NAS actually is
A NAS (Network-Attached Storage) is a small computer that does one job: store files and serve them to your devices over your home network or the internet. It sits in a corner, runs 24/7, and replaces the jumble of external hard drives most people accumulate over the years.
Think of it as your own private Dropbox — except you own the hardware, pay no subscription, and have full control over your data.
Who actually needs a NAS
You will get real value from a NAS if you:
- Have 2+ TB of photos, videos, or music you want accessible on all devices
- Want automatic backups of multiple computers without paying cloud fees
- Stream your own media collection to TVs, phones, and tablets
- Run a small home office and want shared file access without paying for SharePoint
- Are a photographer or videographer moving large files between workstations
You probably don't need a NAS if you have less than 1 TB of files, use iCloud or Google Photos heavily, or just want a backup for one computer (an external HDD is simpler).
NAS vs external hard drive
| External HDD | NAS | |
|---|---|---|
| Cost | $60–$100 | $300–$800 (enclosure + drives) |
| Access | One USB device at a time | Any device on your network |
| RAID / redundancy | No | Yes (RAID 1, SHR) |
| Remote access | Physically carry it | Accessible from anywhere |
| Plex / media server | No | Yes |
| Setup complexity | Plug and play | Moderate (2–3 hours) |
2-bay vs 4-bay NAS
A 2-bay NAS (e.g., Synology DS223) holds two drives and costs around $300 for the enclosure alone. With two 4 TB NAS drives in RAID 1 (mirrored), you get 4 TB of protected storage. This is the entry-point for most home users.
A 4-bay NAS (e.g., Synology DS923+) holds four drives and allows more flexible RAID configurations. It is better for small businesses or serious home labs. The DS923+ supports 10GbE expansion, useful if you move large files frequently.
NAS drives vs regular hard drives
NAS drives (WD Red Plus, Seagate IronWolf) are rated for 24/7 operation, vibration compensation (important when drives are mounted near each other), and longer warranty periods. You should not use desktop or external HDD internals in a NAS — they are not designed for continuous operation and fail faster.
Total cost to get started
- Synology DS223 (2-bay enclosure): ~$300
- 2× WD Red Plus 4TB NAS drives: ~$90 each
- Total: ~$480 for 4 TB of RAID-protected private cloud storage
That compares to $240/year for 2 TB on Google One or $130/year for 2 TB on iCloud. The NAS pays for itself in 2–3 years.
Compare NAS systems and drives →
NAS enclosures and NAS-rated drives ranked by value score and Amazon price.