How to Generate a Backblaze B2 Application Key
Use least-privilege API credentials.
Before you begin
Check whether you are using Backblaze Computer Backup or Backblaze B2 Cloud Storage. The two products have different setup, billing, and recovery procedures. Confirm your operating system, software version, and the exact error before changing settings.
Steps to follow
- Open the Application Keys area in the B2 console.
- Choose a scoped key limited to the required bucket and permissions.
- Set a suitable expiry or file-prefix restriction where supported.
- Store the secret securely; never paste it into a support form.
How to confirm the fix
Repeat the affected task using a safe test. For Computer Backup, check that new files are being backed up and that an appropriate restore point is available. For B2, test a limited upload or download using the intended scoped credentials. A successful status message is not a substitute for a tested restore.
If the issue continues
Record the exact error, time, product, client version, and relevant non-sensitive logs. Consult the official Backblaze Help Center for current instructions. Do not remove the only backup copy, weaken access controls, or disable retention rules just to dismiss a warning.