Here's how to delete your WhatsApp chat backup from Google Drive:

Using the Google Drive App:

Open the Google Drive app on your phone or tablet.
Tap the hamburger menu (three horizontal lines) in the top left corner.
Go to "Backups."
You should see a list of apps that have backed up data to your Google Drive, including WhatsApp.
Find the "WhatsApp Backup" entry.
Tap the three dots next to the backup.
Select "Delete backup."
Confirm the deletion by tapping "Delete" again.

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