Your latest backup history is demonstrated on the left frame. As you can see, the device name, model, iOS version, serial number and even the date, time, size of the backup are displayed. You can select the backup that you want according to the information.
If you can't recognize the one you need, you can view the files by clicking the View icon on the lower left. WhatsApp messages and attachments are listed. Besides, you are allowed to delete the backup by tapping the Trash icon.