WhatsApp and Google agreed to initiate a new agreement. According to this update, WhatsApp backup will no longer reduce Google Drive’s storage quota.
This collaboration will encourage Android users to regularly back up their WhatsApp chat even though they don’t have much storage space on Google Drive.
Google itself has sent notifications regarding this change via Gmail. This policy will apply to all users from 12 November 2018, although some users may be able to enjoy it earlier.
How to Backup WhatsApp Chat on Google Drive
To back up your Google Drive chat, tap the three-point menu from the top right corner of your WhatsApp screen and then go to Settings > Chats > Backup chat. Then hit the Back up button.
You can choose the frequency of backup chat so WhatsApp can automatically save your chat again by tapping the Back up to Google Drive option.