External SSD vs a proper NAS for backups, when is the simpler option actually the smarter one

[Undertaker_EU]

The honest answer depends entirely on what you're actually protecting against. An external SSD plugged into your main computer protects against one specific failure mode, your internal drive dying, and it does that job well, fast transfer speeds, no monthly fees, no configuration, plug it in and copy your files. What it does not protect against is anything happening to the room your computer sits in, a fire, flood, theft or a laptop simply getting lost takes both your computer and the backup sitting next to it in the same event

A NAS solves a different problem. Running in RAID, it protects against a single drive failure without you losing anything at all, the array just keeps running while you swap the dead drive, no restore process required. It also centralizes backups from every device in the house rather than requiring you to manually plug a drive into each one, and most NAS platforms support versioned snapshots, meaning you can recover a file from three weeks ago even if you already overwrote it, something a simple external SSD copy generally cannot do without you manually keeping multiple dated copies yourself

The real answer for anyone serious about not losing photos, documents or anything irreplaceable is that these two solve different threats and the 3-2-1 backup principle exists precisely because of that, three copies of your data, on two different types of media, with one copy stored somewhere physically offsite. A NAS at home covers the local redundancy and centralization piece well, but it is still just one location, an external SSD kept at a family member's house or in a safe deposit box, or a cloud backup service, covers the offsite piece that a NAS sitting in your own house structurally cannot

For most people the pragmatic setup ends up being layered rather than picking one, a NAS at home for day to day redundancy and centralized backup from every device, plus either a rotated external drive kept offsite or a cheap cloud backup service for the one copy that survives even if the house itself has a bad day

[Tracey99]

The 3-2-1 framing is the one people need drilled into them, I see so many folks treat a single external drive as a complete backup strategy when it only covers one of three actual failure modes

[HeartbreakKidOscar97]

NAS snapshots saved me once when I overwrote a document I'd been editing for weeks, being able to just roll back to a version from before the mistake happened was worth the whole setup on its own

[Reacher Quarry]

External SSD sitting right next to the laptop it's backing up is the classic mistake, a house fire or a burglary takes both at once and you're right back to zero

[WWEPete45]

I run a NAS at home for the centralized backup and redundancy, then pay for a cheap cloud backup service specifically for the offsite piece, feels like the right balance of cost and actual protection

[HeartbreakKidOscar97]

The centralization angle for a household with multiple devices is underrated, backing up four family members' laptops and phones to one NAS instead of juggling four separate external drives is a real quality of life win

[Gareth_11]

Worth adding that RAID itself is not a backup, it protects against a drive failure but does nothing if you get ransomware or accidentally delete something across the whole array, snapshots and an actual offsite copy still matter

[DecentBloke]

I learned the hard way that an external drive left plugged in constantly is basically just another internal drive with extra steps, unplug it after backing up or it doesn't protect against anything a surge or malware couldn't also hit