NAS vs. Cloud Backup: Do You Need Both?
Network-attached storage feels like backup — fast, local, under your control. But a NAS sitting in the same building as your primary data has a single point of failure most people never think about.
A NAS and its data usually live in the same room.
Fire, flood, and theft don’t discriminate between your primary drive and your backup drive if they’re sitting next to each other.
A NAS is genuinely great. It’s fast — local network speeds beat almost any cloud connection for both backup and restore. It’s under your direct control, with no recurring subscription required beyond the initial hardware cost. For day-to-day file access and quick local backups, it’s hard to beat.
But a NAS shares one critical thing with your primary data: the building it’s in. And that single fact means it shares every failure mode that comes with that building — fire, flood, theft, or any other event that takes out the physical location, takes out both copies at once.
What a NAS actually protects against — and what it doesn’t
A NAS, especially with a RAID configuration, protects well against one specific thing: a single drive failing. If one disk in the array dies, RAID lets you keep working while you replace it, with no data loss.
The scenario nobody plans for
Ask most NAS owners what their disaster plan is, and the honest answer is often “I haven’t thought about it.” A house fire, a burst pipe upstairs, or a break-in doesn’t care that your NAS has redundant drives — all of them are destroyed or stolen together with your primary machines, in the same event.
This is exactly the gap cloud backup is built to cover. An offsite copy, physically separated from your home or office, survives every scenario that takes out a single location.
NAS vs. cloud backup — side by side
| Factor | NAS | Cloud Backup |
|---|---|---|
| Speed | Very fast — local network speeds for both backup and restore | Depends on your internet connection — typically slower than local NAS speeds |
| Protects against drive failure | Yes, especially with RAID configurations | Yes |
| Protects against fire/flood/theft | No — shares a building with your primary data | Yes — physically offsite by design |
| Protects against ransomware | Only if configured with immutable snapshots | Yes, if the provider supports immutable/WORM backup |
| Ongoing cost | One-time hardware cost, plus your own maintenance time | Recurring subscription, no hardware or maintenance |
| Setup complexity | Higher — you configure and maintain the hardware yourself | Lower — mostly automatic once initially configured |
If you already have a NAS, you don’t need to replace it — you need to add an offsite layer alongside it. And if you’re relying on a NAS alone right now, that’s the single most impactful change you can make to your setup this week.