Every photo storage article eventually arrives at the same question: where should this actually live?
The answer is almost never one of the three. It's a combination, and which combination depends on library size, internet speed, budget, and how many people need access. Here's how the three compare and how to pick.
The short version
External drive: cheapest, fastest, simplest. Fails eventually. Right for almost everyone as the primary local copy.
NAS: expensive, powerful, always-on, shared across a household. Right for large libraries, multiple contributors, and people comfortable with a bit of setup.
Cloud: best for offsite protection and access anywhere. Slow for large volumes, ongoing cost, and you're dependent on a company and an account.
What most people should do: external drive as the working copy, second external drive or NAS as local backup, cloud for the offsite copy. That's the 3-2-1 rule expressed in hardware.
External hard drives
What it is: a drive in an enclosure that plugs into your computer.
Costs
A 2 TB portable drive runs roughly $60–90. A 4 TB desktop drive with its own power supply is around $100–130. SSDs cost several times more per terabyte but are faster and more shock-resistant.
One purchase, no subscription. Over ten years this is by far the cheapest option per gigabyte.
Strengths
Speed. Copying 500 GB takes an hour or two. The same restore from the cloud can take days.
Simplicity. Plug it in, drag files. No configuration, no account, no ongoing dependency.
You own it. No subscription that can lapse, no account that can be suspended, no company that can change terms.
Portable. It goes in a bag to a relative's house, which makes it a viable offsite copy for people with slow internet.
Weaknesses
They fail. Mechanical drives have moving parts and a finite life — commonly five to seven years, sometimes much less. Failure is often sudden and total.
Single point of failure. One drive means one copy. If it's your only copy, you don't have a backup strategy; you have a countdown.
Easy to lose or damage. Dropped, stolen, spilled on, taken by the same house fire as everything else.
Only accessible when connected. No access from your phone, no access away from home.
Picking one
Portable (2.5", USB-powered) — smaller, no power brick, good for transport. Slightly slower and generally lower capacity ceiling.
Desktop (3.5", own power supply) — faster, cheaper per terabyte, higher capacities. Stays put.
SSD — no moving parts, much faster, survives drops. Worth it for a drive you carry; unnecessary for one that sits on a desk holding an archive.
Buy two, from different manufacturers or at least different purchase dates. Drives from the same batch can share a defect and fail around the same time. This is one of the more useful pieces of advice in this article, and one of the least followed.
NAS (Network Attached Storage)
What it is: a small always-on box holding two or more drives, connected to your home network. Everyone in the house can reach it, and it can usually be reached from outside the house too.
Costs
A two-bay enclosure runs roughly $200–400 without drives. Drives are separate — two 4 TB drives add $180–250. So $400–650 to start, plus electricity, plus drive replacements over time.
Strengths
Redundancy built in. Configured to mirror, a two-drive NAS survives one drive failing. You replace the failed drive and it rebuilds itself. This is the main reason to own one.
Shared access. Everyone in the household reaches the same library. This solves a real and common problem: a family's photos scattered across four devices with no shared archive.
Always on. Backups can run automatically without you plugging anything in — which matters, because backups that need a human step are backups that stop happening.
Large capacity. Easily scales into tens of terabytes.
Remote access. Most can be reached from outside your home, giving you cloud-like access to storage you own.
Runs its own backups. A NAS can back itself up to the cloud on a schedule, without a computer being involved.
Weaknesses
Cost. Several times an external drive, before you've stored a single photo.
Complexity. Initial setup involves network configuration, user accounts, and share permissions. Not difficult, but not nothing, and it's a genuine barrier.
Speed limited by your network. Over Wi-Fi, transferring large video files is noticeably slower than a directly connected drive.
Mirroring is not a backup. This trips people up constantly. Mirroring protects against a drive dying. It does not protect against deletion, corruption, ransomware, theft, or fire — all of which hit both drives identically. A NAS still needs its own backup.
It's a computer. It needs occasional updates, and a NAS exposed to the internet without maintenance is a genuine security risk.
Who it's for
Libraries over about 2 TB. Households where several people contribute photos. Anyone doing video seriously. People who want automatic backups without plugging anything in.
Not worth it for a 400 GB library that one person uses.
Cloud storage
What it is: files on someone else's servers, reached over the internet.
Worth distinguishing two different products:
Cloud sync (Google Drive, Dropbox, iCloud, OneDrive) mirrors your files. Delete something and it deletes everywhere.
Cloud backup (dedicated backup services) keeps versions and retains deleted files, so you can restore how things were last month.
These are not interchangeable, and confusing them is the most common mistake in this whole topic.
Costs
Ongoing, typically monthly. Cloud sync services charge per storage tier. Dedicated backup services often charge a flat rate per computer for unlimited storage, which is dramatically better value for large libraries.
Because pricing changes constantly, compare current rates — but the structural point holds: for a 3 TB photo and video library, a flat-rate backup service is usually far cheaper than a per-terabyte sync service.
Strengths
Genuinely offsite. This is the whole point. Fire, flood, theft, and lightning take out everything in your house at once, including all your local backups.
Access anywhere. Your library on any device, anywhere.
No hardware to maintain. Drive failure is someone else's problem.
Automatic. Set up correctly, it runs without you.
Versioning. Real backup services let you recover a file as it was before you broke it.
Weaknesses
Upload time. This is the practical dealbreaker for large libraries. On a 10 Mbps upload connection, 1 TB takes roughly ten days of continuous uploading. Many rural connections are slower. For a 3 TB library, the initial upload can take over a month.
Restore time. Getting everything back after a total loss is equally slow. Some services will mail you a drive for a fee, which is worth knowing before you need it.
Ongoing cost forever. Stop paying and your data is deleted, typically after a grace period.
Account risk. Lockouts, suspensions, and closures happen. Recovering a lost account with no other access is genuinely difficult.
Privacy. Your photos are on someone else's infrastructure. Most services encrypt in transit and at rest, but a service holding the keys can technically access your files. Some backup services offer private encryption keys, which solves this — with the caveat that losing the key means losing everything, permanently.
Who it's for
Everyone, as the offsite copy. Nobody, as the only copy.
Head to head
| External drive | NAS | Cloud | |
|---|---|---|---|
| Up-front cost | $60–130 | $400–650 | $0 |
| Ongoing cost | None | Electricity | Monthly, forever |
| Speed | Fast | Medium | Slow |
| Survives drive failure | No | Yes | Yes |
| Survives house fire | No | No | Yes |
| Survives account loss | Yes | Yes | No |
| Access away from home | No | Usually | Yes |
| Multiple users | No | Yes | Yes |
| Setup effort | Minutes | Hours | Minutes |
| Works on slow internet | Yes | Yes | Poorly |
The two rows that matter most are the two failure rows. Local storage survives account loss but not fire. Cloud survives fire but not account loss. They fail in different ways, which is precisely why you want both.
Three setups that work
Small library, small budget (under 500 GB)
- Working copy on your computer
- Backup to one external drive, automatic
- Cloud backup service for offsite
Cost: about $80 up front, plus a modest monthly fee. Covers 3-2-1 properly and suits most families.
Large library, slow internet
- Working copy on an external drive
- Backup to a second external drive at home
- Third drive stored at a relative's house, swapped every couple of months
Cost: about $250, no subscription. This is the right answer for a lot of rural households where uploading a terabyte simply isn't practical. The weak point is discipline — put the swap on a calendar and treat it as non-optional.
Large library, multiple people, video
- NAS as the main library, mirrored
- Everyone in the house syncs to it
- NAS backs up automatically to a cloud backup service overnight
- Optionally, an external drive that gets a periodic copy for a third local layer
Cost: $500–800 up front plus monthly. Substantial, and it's the setup that stops requiring thought once it's running.
What to actually do
If you currently have one copy of your photos, none of this comparison matters yet. Buy a 2 TB external drive today and copy everything to it. Two copies is where nearly all the risk reduction lives. Everything after that is refinement.
Then add offsite — cloud backup if your connection can handle it, a drive at a relative's house if it can't.
Consider a NAS only when you've outgrown drives: multiple people contributing, more than a couple of terabytes, or you're tired of plugging things in.
And whichever you choose: test the restore twice a year. An untested backup is a hope. Pick a photo from a few years ago, restore it from your backup, open it, confirm it's right. Fifteen minutes, and it's the difference between a backup strategy and the appearance of one.
Next in this series: A 30-Day Photo Organization Plan (15 Minutes a Day)