You can archive a Team if it is no longer needed then restore it from the archive if it is needed again. At the moment, there is no way to take a team offline (including chat messages, tasks, and documents).

You can download the files locally, but that will only give you the most recent version of the files. The version history will be lost.

Contact us at 1800 126 499 or [email protected] if you have further questions about security and backup for Microsoft Teams.