The 3-2-1 backup rule, explained for people who hate backups
Most data loss is boring: a dropped laptop, a spilled drink, a stolen bag. A simple routine protects you from nearly all of it.
Almost everyone has the same story: a laptop dies, and with it go ten years of photos. The fix is not complicated. It is a habit with a catchy name.
What 3-2-1 means
The 3-2-1 rule says to keep:
- 3 copies of anything you care about (the original plus two backups),
- on 2 different types of storage (for example, your computer and an external drive),
- with 1 copy somewhere else (a cloud service or a drive kept at another address).
Each part protects against a different failure. Two copies on one device die together. Two copies in one house can be lost to a fire or a burglary.
A setup that takes under an hour
- Turn on your computer’s built-in backup. Windows has File History and macOS has Time Machine. Plug in an external drive and switch it on.
- Add a cloud backup. Pick a reputable service that backs up folders automatically, and let it run in the background.
- Check one restore. Open a backup and recover a single file. A backup you have never tested is a hope, not a plan.
What to back up first
Start with things you cannot recreate: family photos and videos, tax and financial records, important documents, and any work that is not stored elsewhere. Software can be reinstalled, so it comes last.
Mistakes to avoid
- Leaving the drive permanently plugged in. Ransomware can encrypt connected drives. An occasional disconnected copy is a useful safeguard.
- Treating sync as backup. Services that mirror a folder across devices will also mirror an accidental deletion.
- Never checking. Set a calendar reminder every few months to confirm your backups are still running.
If this feels like too much, do the smallest useful version today: copy your photos to one external drive. That alone puts you ahead of most people.
