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