Where can I find my Android backup in my Google account? What is the name of my android backup in my android device?
Google does not backup your whole Android device. Only your apps, and, if you have a nexus device (< not sure), the app's data will be backed up. And if you turned on automatic camera backup in the Google Photos app, your photos are backed up, too
You can't download these backup from your PC or another device. To restore it you have to login on a new/factory reset device. Then it will ask you to restore your apps.