A NAS (Network Attached Storage) is a small purpose-built computer with shared storage that sits on your home network and runs continuously. In 2026, the entry-level price has dropped below $300 (UGREEN DXP2800), the software has matured into a polished ecosystem (Synology DSM, UGREEN NASync OS), and the use cases have expanded beyond “file backup” into media streaming, photo libraries, surveillance recording, and self-hosted applications. The honest question is not “is a NAS cool” but “would a NAS save me time or money on something I already do.” This guide walks through what people actually use a NAS for, the buying decisions that matter, and the real comparison against cloud storage in 2026.
What people actually use a NAS for
Survey the active NAS user base in 2026 and most use cases fall into five buckets:
Media server. Plex, Jellyfin, or Emby running on the NAS, indexing your ripped Blu-rays, music collection, and home videos. Stream to phones, TVs, and friends/family over the internet. This is the single most common reason to own a NAS and the one that makes a casual buyer interested.
Photo library. Replacing iCloud Photos or Google Photos with a local-first library using Synology Photos, Immich, or PhotoSync. Tens of thousands of family photos and videos stored on your hardware, accessible from phones, with face recognition and automatic backup from devices.
Computer backup. Time Machine target for Macs, Windows backup target, automatic phone backup via the manufacturer’s app. Centralized place for the household to back up devices.
File share. Documents, scans, family records accessible from any device on the home network and selectively from outside via VPN or QuickConnect.
Self-hosted apps. Home Assistant (smart home), Pi-hole (network-wide ad blocking), Nextcloud (calendar/contacts), Vaultwarden (password manager), AdGuard, dozens of others via Docker.
A NAS that does one of these is useful. A NAS that does all five is the central infrastructure of a household network.
Disk count and capacity planning
The most common entry-level NAS form factors:
- One-bay: insufficient redundancy, treat as expensive USB drive
- Two-bay: minimum sensible configuration, allows RAID 1 mirroring
- Four-bay: typical for serious home use, allows RAID 5/SHR with one drive of parity
- Six- or eight-bay: power-user / small-business tier
For a first NAS, four bays is the sweet spot. It lets you start with two drives and add capacity later without rebuilding the array.
Drive sizing depends on what you store. Rough capacities for typical use:
- Document and basic file backup for a household: 1 to 4 TB usable
- Photo and home video library (full-resolution iPhone shots and 4K video): 4 to 12 TB usable
- Movie/TV library (4K rips average 50 to 80 GB each, 1080p 8 to 15 GB): 12 to 50 TB usable
- Music library (lossless FLAC, ~30 MB per song): 1 to 5 TB usable
Buy more capacity than you think you need. Migration to bigger drives is painful and adding drives partway through life is easier when there are empty bays.
RAID levels, what to actually use
RAID 1 (mirror): every byte is written to two drives. Half the total capacity is usable. One drive can fail without data loss. Simple and bulletproof.
RAID 5 / SHR-1 (single parity): three or more drives, one drive’s worth of capacity is parity. (Drive count - 1) drives’ capacity is usable. Single drive failure is recoverable.
RAID 6 / SHR-2 (double parity): four or more drives, two drives’ worth of parity. Survives two simultaneous drive failures. Recommended for arrays with drives 8 TB or larger because rebuild time is long enough that a second failure during rebuild is plausible.
RAID 0: striping with no parity. Never use on a NAS that holds anything you care about.
For a two-bay NAS: RAID 1. For a four-bay NAS: SHR-1 or RAID 5. For a six-bay+ NAS with drives above 8 TB each: SHR-2 or RAID 6.
RAID is not backup
The most-repeated NAS warning, and still true. RAID protects against drive failure. It does not protect against:
- Fire, flood, or theft (NAS and drives are in the same place)
- Ransomware (encrypts everything on the NAS)
- User error (deleted folder syncs to all RAID members)
- File system corruption
- Multiple simultaneous drive failures beyond the parity level
A real backup strategy is 3-2-1: three copies, two different media types, one off-site. For a NAS user, that means the data lives on the NAS, a snapshot lives on another drive (USB external or another NAS), and a copy lives off-site (Backblaze B2, AWS Glacier, encrypted folder on a relative’s drive 100 miles away).
Performance, what to expect
A typical home NAS in 2026 delivers:
- Sequential read over gigabit ethernet: 110 to 115 MB/s (saturates 1 GbE)
- Sequential read over 2.5 GbE: 280 to 300 MB/s
- Sequential read over 10 GbE: 600 to 1,200 MB/s (limited by drives)
- Random small-file performance: 50 to 200 MB/s, depending on cache and CPU
For media streaming (one to four simultaneous Plex transcodes), any modern NAS is sufficient. For photo editing directly off the NAS (Lightroom catalog on the network), 2.5 GbE is the minimum and 10 GbE makes a noticeable difference.
NVMe SSD caching (offered by Synology, UGREEN, QNAP) speeds up small-file random reads. It does not change sequential throughput.
Cloud vs NAS, the cost comparison
A 4 TB cloud storage plan (Google One, iCloud, Backblaze B2 calculations) costs roughly $10 to $20 per month, or $120 to $240 per year.
A four-bay NAS with 24 TB usable (e.g. four 12 TB drives in SHR-1) costs roughly:
- Synology DS923+ or DS1522+: $550 to $700
- Four 12 TB enterprise drives (Seagate IronWolf Pro, WD Red Pro): $900 to $1,200
- Memory upgrade: $50 to $150
- Total: $1,500 to $2,050
Operating cost (electricity at $0.15/kWh for 24/7 operation at 30W): $40 per year.
At a household need of 8 to 12 TB of data, the NAS pays back in 7 to 10 years against cloud. At 20+ TB, it pays back in 3 to 4 years and the NAS keeps working while cloud bills compound.
If your data need is modest (under 1 TB), cloud is almost always cheaper and lower-effort. If your data need is large or rapidly growing, NAS economics win.
Picking a 2026 NAS
| Use case | Recommended unit |
|---|---|
| First NAS, casual use | Synology DS224+ ($300 to $350, 2-bay) |
| Family with photo and media needs | Synology DS923+ ($550, 4-bay) |
| Heavy media server, multiple transcodes | UGREEN DXP4800 Plus ($600, 4-bay with strong CPU) |
| Power user, dozens of apps | UGREEN DXP6800 Pro ($900, 6-bay) |
| Enterprise / small business | Synology DS1522+ or QNAP TS-h1290FX |
For storage decisions on the wired-network side, see our Thunderbolt 4 vs USB4 explainer. For the network architecture that delivers NAS speed to every room, our mesh Wi-Fi vs router guide covers the backbone choice.
Frequently asked questions
Is a NAS worth it in 2026 vs cloud storage?+
Depends on how much data and what you do with it. For under 500 GB, cloud services (iCloud, Google One, Dropbox) are easier and similarly priced over five years. Above 2 TB of frequently accessed media or photos, a NAS pays for itself in 3 to 4 years and gives you faster local access. Above 10 TB, cloud storage at typical consumer pricing is prohibitive.
Synology vs UGREEN vs QNAP in 2026, which one?+
Synology still has the best software (DSM) for non-technical users and the strongest community for troubleshooting. UGREEN entered the market in 2024 with strong hardware and rapidly improving software at lower prices. QNAP has powerful hardware and decent software but a worse historical security record. For a first NAS, Synology is the safer pick; for value, UGREEN.
Do I need RAID for a home NAS?+
If you have two or more drives, yes, in some form. RAID 1 (mirroring) gives you protection against a single drive failure at the cost of half your capacity. SHR or RAID 5/6 use parity for better capacity efficiency. RAID is not a backup; if a fire, theft, or ransomware hits, you still need an off-NAS backup.
Can a NAS replace my media-streaming subscriptions?+
It can replace the storage side (ripping your physical media or storing your own video files for Plex/Jellyfin playback) but not the licensing side. Netflix's catalog cannot be legally stored on a NAS. For users with large physical media collections (Blu-rays, DVDs) and family photo/video libraries, a NAS is a strong centralization point.
How much electricity does a NAS use?+
A two-bay home NAS with two 3.5-inch drives consumes roughly 25 to 45 watts under typical load, less in disk-spin-down mode. Over a year at $0.15 per kWh that is $30 to $60 in electricity. Higher-end multi-bay enterprise units climb to 80+ watts. The hardware is engineered for 24/7 operation.
