Where is the "Chat Backup" feature?

I'm using WhatsApp, and I want to backup my WhatsApp chat history using the Google Drive backup.

I have all the requirements met, I'm using a Nexus 5, Android 6.0.

Although, when I enter the Settings Menu -> Chats and calls I don't see any "Chat Backup" menu feature, I've also changed the locale language of my phone cause I thought it might not be translated correctly, and still, nothing changed.