[capableweb]

What you receive in your email is not email attachments with the backup, but links that starts the download. So no additional storage is being used.

Maybe they should make it clearer, but for me "Email download link" is already pretty clear.

FWIW: The download link ends up being something like https://takeout.google.com/takeout/download?j=X&i=0&user=X&r... and doesn't count to any of your storage quotas.