How to change the Board Link on a Miro Board (to stop viewing, editing by members who have left the company)
Removing Access to past members
And, since you are concerned about people who have left your company still having access to a board, I will assume that you removed them from your Miro team space, but the boards would be accessible because you have visitor access enabled. Rather than deleting the original board, I would suggest that you disable visitor access, and even restrict it to those who need access to the original for recovery purposes.
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