Select the .zip file produced by the Quartz app when you tapped Export Backup. This is an encrypted file — it looks like a ZIP but contains AES-256-GCM encrypted data.

Enter the master password that was set when this backup was created. If you have changed your password since then, use the older one.

Clicking Decrypt Backup decrypts your file locally, reads every vault entry, and unlocks the download buttons below. Nothing is sent to any server.