Import and export of a team

Hi StefanKi, 

1. is it possible to export the results of the assignments of a team in one file?

Here is documentation on how to export the results of the assignments of a team into an excel file. You can do so with one assignment or all of the assignments per class: https://support.microsoft.com/office/export-grades-from-microsoft-teams-to-excel-c9d18b59-0abb-4fd7-96cf-cd5330cae534. 

2. Is it also possible to export all the content of a team in a sort of zip file, to archive a team? Is it also possible to re-import it easily?

There is no clear way to export all content of a team via a zip file, but it is possible to restore a deleted team and unarchive an archived team. Please view the documentation here for instructions: https://docs.microsoft.com/en-us/microsoftteams/archive-or-delete-a-team