Their service is backed by zero-knowledge architecture, meaning that your data is encrypted and decrypted at your device level. All data that you store in your vault is already encrypted, and only you know the details. Your master password, encryption, and decryption keys never reach their servers. And this is a key reason why they do not provide an automated master password recovery via email. If you need more information about your master password recovery, check the question: What happens if I forgot my NordPass Master Password.