MS Teams wipe all data at once

Hello, I would probably use (or test at least) the preview feature "Create a team template from an existing team in Microsoft Teams" and use that template when creating a new team, instead of wiping all content. For the latter, and for the record, there's much more work involved with deletion. If it's only about removing all the channel posts (i.e. team chats) then you could use a retention deletion policy for channel messages with a 1-day removal (it will take longer as the underlying service need to process the deletion request). But if files are also involved then you'd have to add a deletion policy for SharePoint as well.

For reference:

https://docs.microsoft.com/en-us/microsoftteams/create-template-from-existing-team

https://docs.microsoft.com/en-us/microsoft-365/compliance/retention-policies-teams?view=o365-worldwide