Hi @sarl.dbdc,
We have a general backup/migration procedure here, for any supported storage:
** Important Note **: For Google, there additional considerations because of their Google Document files, which only exist within Google and need to be exported for migration. Because of this, you will likely want to look at Google’s own “Takeout” tool, which provides a way to export all of your Google Account data, including Google Drive and Google Documents: https://takeout.google.com
Google’s support page for Takeout: How to download your Google data - Google Account Help