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Data Backup & the 3-2-1 Rule

Relax. We'll talk through this in plain words — no textbook voice.

What you'll walk away with

  • Understand Data Backup & the 3-2-1 Rule, no intimidation required
  • Apply this concept right away in real-world scenarios
  • Learn to avoid security risks for yourself and others

Let's think about it this way for a second

The 3-2-1 backup rule: keep **3** copies of your data (the original plus 2 backups), on **2** different types of storage media (e.g., an external drive plus cloud), with **1** copy stored offsite (e.g., in the cloud, or a physical drive kept somewhere else) — that way a single fire, theft, or ransomware attack can't wipe out all your data at once. Having backups isn't enough on its own, though — you only know a backup actually works once you've regularly tested the restore process.

Let's connect this to a real-world scenario

If you're hit by a ransomware attack, a backup may be your only way to get your files back — restoring from a backup instead of paying the ransom means you can recover your files without paying the attacker a cent. Combining cloud backup (Google Drive, Dropbox) with an external hard drive is an easy way to hit the 3-2-1 rule.

Let's look at it together

text
3-2-1 Backup Rule
------------------
3 copies    → original + 2 backups
2 mediums   → e.g. external HDD + cloud storage
1 offsite   → e.g. cloud, or drive at a different location
You should see
Be able to plan out the 3-2-1 backup rule for your own data.

Try it in 5 minutes

Write out how you'd actually implement the 3-2-1 rule for your own most important files (photos, documents).

A quick word of caution

Some advanced ransomware can encrypt connected backup drives too — you should keep at least one backup offsite or offline.

Easy traps

  • Keeping backups on only one device (if that device fails, the backup is gone too)
  • Never test-restoring your backups — you only find out the backup file is corrupted when it's too late

Now try it yourself

Write out how you'd actually implement the 3-2-1 rule for your own most important files (photos, documents).

You'll know it worked when: Be able to plan out the 3-2-1 backup rule for your own data.

Data Backup & the 3-2-1 Rule | Thuta Learning