WhatsApp backup is essential because if your WhatsApp chat is deleted or your phone is lost, you can recover back the conversation. But, WhatsApp Backup is 100% not safe.
1. First of all, open your Drive apps.
2. Then, click three horizontal lines at the top left corner.
3. Next, select Backups.
4. After that, click three dots of the WhatsApp backups file.
5. Then, click Delete backup and your WhatsApp backup will be deleted from google drive.