I'll be honest. When I first got started with NAS systems, I had a bit of misplaced confidence. You buy a nice pre-built NAS like a Synology, fill it with drives, set up RAID and set it up to sync with your computer. That's it, right? All your data should be safe and secure. But here's the unfortunate reality. Your NAS isn't a backup, and RAID is a redundancy measure at best. In fact, when not configured correctly, a NAS can be the single point of failure for most people. And when it fails, it can very quickly bring down all your data and media with it.

Look, it makes sense. We tend to treat our NAS as the ultimate safety net. With multiple hard drives duplicated to each other, a NAS is essentially a digital vault for all your storage. But real life doesn't work like that. A single power surge can kill hard drives or burn your power supply. A bad software upgrade can corrupt your storage volumes. Accidental deletions and ransomware are a thing. It's not a matter of whether it'll happen. It's more about when. And when it does, you'll wish you had taken extra steps to rethink your backup strategy. Repeat after me, a RAID array is not a backup, a cloud sync is not a backup, and a NAS without redundancy is definitely not a backup.

A NAS isn't the backup you think it is

RAID isn't enough to keep your data safe

Most people misunderstand what a NAS is supposed to do. A NAS is great for convenience and for having a central spot to store all your data like photos, music, documents and more. But that convenience becomes complacency. Yes, a NAS offers redundancy, but only against the failure of a single hard drive. Lost a hard drive, and you just replace it. But that's not protection, that's just protection against downtime. RAID keeps your NAS running when a disk fails, but not when your house floods, a power surge takes out your NAS, or an accidental command kills a storage volume.

Cloud sync is another myth. Sync is not backup. It mirrors what's on your NAS. If you delete something accidently, or get hit by ransomware, your cloud copy also becomes useless. Now, to be sure, snapshots can come in handy. But snapshots live on the same device. If your NAS dies, your snapshots go with it. You catch my drift.

Your foundation for foolproof NAS backups

Three copies, two types of storage and one offsite backup

Basically, if you care about your data, be it family photos or creative projects, client work, or even just a carefully organized media library, you need to follow the basic 3-2-1 backup rule. Three copies of your data, in two different types of storage, with one stored offsite. It sounds tedious, but it's actually very simple once you break it down.

Your NAS can be your primary hub or the base where everything lives and stays organized. That's where you store your primary copy of data. Then you add in a second copy. This could be an external hard drive, or another NAS sitting elsewhere in your house. You can either set these two devices to sync with each other or set up a regular scheduled task so that they happen automatically.

Your third backup should be an offsite backup. This can either be yet another NAS drive placed at a friend of family member's home. Or, you can use a cloud storage provider like Backblaze B2, Synology C2, or Wasabi. There are many ways to pull this off but if you are using a Synology NAS, you can use the built-in Hyper Backup tool to send up backups to the cloud. NAS boxes from other manufacturers like QNAP and TrueNAS also have similar built-in tools that let you back up to a cloud provider. Once set, it automatically runs in the background and sends up encrypted, versioned backups to the cloud without needing to do anything.

This final offsite backup is a key part of the puzzle. It protects you from fires, floods, theft, or a serious crash. While you're at it, enable versioning. It is the single best way to protect against corruption and accidental deletions. Instead of overwriting old files, versioned backups keep older copies for a configurable amount of time and gives you the ability to roll back to a clean state if something goes wrong. Finally, it's also a good idea to test these backups every couple of months. Download a few files and make sure they open as they should. Verify that your backups are running on schedule.

It's now about if your NAS will fail, it's about when

Let's be honest. Nobody seriously thinks about backups until they lose something. Your first thoughts about a backup are usually when it's already too late. It's easy to assume that your NAS will keep running forever or that the odds of failure are too small to worry about. But every drive has a life, and every NAS can break down. It's best to assume that it's a matter of when, not if your NAS will break down. And being fully prepared with a well-thought-out NAS backup strategy is critical to peace of mind.