Almost everyone who loses data was fairly sure they were covered. The gap is usually the same one: what they had was a sync, or a copy, or an old external drive in a drawer — none of which is a backup when it matters. And the day it matters doesn't book an appointment — a clicking drive, a stolen laptop, a ransom note where your desktop used to be.
Professional recovery from a dead drive is priced like the emergency it is — see what data recovery actually costs — and sometimes brings nothing back. A working backup makes the whole subject boring, which is the goal.
The rule that survives everything: 3-2-1
Three copies of anything you cannot bear to lose, on two different kinds of storage, with one of them somewhere else entirely. It sounds like an IT slogan until you notice what it defends against: the drawer copy handles a failed drive, and the off-site copy handles the fire, the flood and the burglary that took both computer and drive together.
At home that boils down to two habits: an external drive that backs itself up automatically, and a cloud copy that leaves the building on its own. Businesses have payroll riding on the same idea — see the 3-2-1 rule for business owners.
Why OneDrive, iCloud and Dropbox are not a backup
Sync services mirror your mistakes. Delete a folder, or let ransomware encrypt one, and the change is faithfully copied to the cloud within seconds. They are genuinely useful — most keep deleted files and older versions for around 30 days, which has saved plenty of people — but that window is short, and it only covers the folders you actually sync.
Two quieter problems seal it. Sync covers only the folders you point it at — usually Desktop and Documents — while photos on a second drive, the mail archive and the accounting data sit outside. And the account is a single point of failure: hacked or locked, your "backup" vanishes with the original, because it was never a second copy — just the first one, visible from two places.
Windows 11 muddies this further with an app literally named Windows Backup, which mostly signs you deeper into OneDrive sync. A backup is a separate, versioned copy that a mistake on the computer cannot reach.
Layer one: the local drive that runs itself
Buy an external drive at least twice the size of your computer's storage — versions take room, and old versions are precisely what make the built-in tools backups rather than copies.
On Windows
- Plug the drive in, then search the Start menu for File History — on Windows 11 it lives in the old Control Panel, not Settings.
- Click Turn on and confirm the drive. File History then saves your libraries, Desktop and Favorites on a schedule, hourly by default.
- In Advanced settings, choose how often it saves and how long versions are kept. To cover a folder it misses, add that folder to a library — File History only watches libraries.
On a Mac
- Plug the drive in; macOS will usually offer to use it for Time Machine. Say yes.
- If it doesn't ask, open System Settings, search for Time Machine and add the drive yourself.
- Leave it connected when you can. Time Machine keeps hourly snapshots for a day, dailies for a month and weeklies until the drive fills.
Layer two: the copy that leaves the building
A proper cloud backup service installs a small agent that copies everything, keeps version history, and never stops to ask. Three names cover most home users; their models differ more than their prices:
- Backblaze is the simple one — unlimited backup of one computer, connected external drives included, for $9 a month or $99 a year as of September 2026. No choosing folders — it takes the lot, which is exactly what you want.
- iDrive sells a fixed pot of storage instead — the personal tier is 5TB — shared across every computer and phone you own. Renewal rates run around $100 a year as of September 2026 behind a heavily discounted first year, so read the renewal price, not the intro one.
- Carbonite works like Backblaze — unlimited backup priced per computer, billed yearly — but covers external drives only on its higher tiers. Check their current pricing; the tiers move around.
If everything you care about fits in a Microsoft 365 or Google One plan — a terabyte or two for roughly $10 a month at standard rates in 2026, though both keep reshuffling tiers — you can lean on that, provided every important file lives in the synced folders and you accept the short undo window instead of real version history. A budget compromise, not a backup service.
Your phone is probably the real crown jewels
Ask people what they'd carry out of a burning house — the photo albums. The album is now a phone, and phone backups fail silently more often than computer ones.
Check today that iCloud Photos or Google Photos backup is switched on and not paused for lack of storage — a full free tier quietly stops uploading, and a paused backup is the commonest phone data loss there is. These are sync services too: delete a photo and the cloud copy follows it into a trash that empties within a month or two. Once or twice a year, plug the phone in and copy the camera roll onto the machine layers one and two already protect.
Ransomware changes one thing
Modern ransomware hunts for connected backup drives and encrypts them too. Keep at least one copy disconnected — an external drive you plug in weekly and unplug afterwards is unglamorous and completely effective — or use a backup service with versioning, so you can roll back to before the infection. The criminals know about the 30-day sync window too.
A backup you have never restored is a rumour
Twice a year, open the backup and pull one real file out of it. On Windows that's Restore personal files inside File History; on a Mac, enter Time Machine and step a folder back in time; for a cloud service, download one document from its dashboard. The five-minute test catches the drive that quietly stopped backing up in March — the single most common way "I had a backup" turns into "I had a backup until March." While you're there, check the date on the newest backup — it should say today.
What to protect first, if you do nothing else today
Photos and videos. Documents and anything tax-related. The accounting data if you run a business. Password manager exports and recovery codes. Programs and Windows can be reinstalled; none of these can be recreated at any price. If your drive has started clicking, freezing or losing files, read the warning signs of a failing drive now — and if something is already missing, stop using the machine and read what to do about lost files first: every minute of use overwrites what might still be recoverable.
Set up once, tested, and off your mind
An hour of screen-share covers all of it: a technician sets up the local drive and the cloud service, pulls a test file back out of each so you've seen the restore work, and leaves it running itself. Post the job free on Koadi — "set up proper backups on two computers" is plenty. Vetted, identity-verified technicians pick it up, you set a fixed price or take bids, and payment sits in escrow until you approve the work. Remote help covers every US state, with on-site visits through local technicians when hands are needed. After that, a dead drive really is an errand.