support.google.com/accounts/answer/3024190?hl=en&rd=1

You can download the data associated with your Google Account so that you can use it in another service or keep a copy for your records. You can request this info using the “Download your Data” tool. Here’s how:

www.youtube.com/watch?v=aZThPQcpfos

This video describes the basics for how to use Google Takeout to create a backup (archive) of your Google account.