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One-time codes you save to get into your account if you lose your phone.

Definition

Backup codes are one-time codes you store safely so you can log in if you can’t use your normal second factor.

In plain English One-time codes you save to get into your account if you lose your phone.

Why this matters

Why it matters: They help you recover without disabling security—but if stolen, they can also let someone else in.

Example

Example: You print backup codes and keep them in a locked drawer.