Go to:

https://myaccount.google.com  and sign in with your Math GSuite credentials

On the left click on Data & Personalization

Click Start Transfer under Transfer Your Content

The steps will take you through transferring all files in your Google Drive and/or your Gmail messages.   This will copy and transfer -- the original files will stay in your Math GSuite account.

More information is available here:  https://support.google.com/accounts/answer/6386856?visit_id=636807545617692260-3194481195