Hi @Dr Carlin
Teams tag is mainly focused on the general issue of Microsoft Teams troubleshooting. According to your description, your question is not in our support scope.The following suggestion is just for your reference:
There are a few ways to back up Class Notebooks and files from Microsoft Teams to an external device.
For Class Notebooks, students can copy their notes from their school account to their personal account using OneNote for the web. They can sign into their school’s Microsoft 365 portal using their student credentials, select OneNote > Class notebooks, right-click on the notebook they want to copy to their personal Microsoft account and select Save a Copy. A pop-up window will appear, prompting them to choose where they want to save a copy of this notebook. They can choose Save to a Microsoft Account.
For files in Microsoft Teams, students can sync them to their device using OneDrive. They need to have OneDrive installed and go to the “Files” tab in a channel in their Team and click “Sync.” Teams will attempt to connect to the OneDrive client on their device. If they don’ t already have the OneDrive client installed, they can click on the “Get the Latest Version of OneDrive” link and follow the instructions to install it on their computer.
For files/folders saved in OneDrive, students can download a copy of their OneDrive files.
For more details you can refer to these two documents: https://support.microsoft.com/en-us/topic/students-export-a-copy-of-your-work-from-onenote-class-notebook-teams-and-onedrive-deb62dce-c441-41b0-b2fc-fccd3cc99c1b
https://www.howtogeek.com/714723/how-to-sync-files-in-microsoft-teams-to-your-device/
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