Whiteboard is the latest Teams-enabled app to use OneDrive for Business for its storage. It’s unsurprising and it’s a trend likely to continue, and it creates an administrative challenge in terms of how to handle deleted Microsoft 365 user accounts. The suggested approach of having a designated user review the information and retrieve what’s important is OK for documents but doesn’t work for app-linked content. Retention policies are a better option.
https://office365itpros.com/2022/01/06/onedrive-teams-app-storage/
