https://wccftech.com/whatsapp-is-adding-end-to-end-encryption-for-google-drive-and-icloud-backups/

Facebook-owned WhatsApp decided to add another layer of security and has confirmed that end-to-end encryption for cloud backups will be rolling out soon. This announcement was made in a Facebook Engineering blog post, and for those who are wondering, end-to-end encryption was never a part of cloud backups, even though the app has had the support for encrypted chats since 2016.

The current implementation that WhatsApp has relies mainly on iCloud and Google Drive for cloud back. Still, security was only there with two-factor authentication whenever you would restore something on your device.