If anything has failed, or there are changes that need to be made to your backups, the smartphone which is being backed-up to Drive will let you know. It’s only via the device itself that you’ll be able to make any meaningful changes too.
To find your smartphone backups within Google Drive following the latest change, you should click on the numbers under the “Storage” shortcut on the navigation sidebar.
From there, tap on the blue “Backups” label at the top of the Drive window and you’ll be shown a complete view of your Google Drive backups, including device backups as well as those from WhatsApp.
If you prefer, you can also manually navigate there via drive.google.com/drive/backups or bookmark the URL if you need to regularly access these important files from your desktop.