An update can do more than edit a resource in place: it can replace it with a new one, and a replaced table or bucket starts empty. CloudFormation 24 offers four safeguards, from preview to veto: change sets show what an update will do, stack policies refuse updates to chosen resources, termination protection refuses to delete a stack, and DeletionPolicy keeps a resource after its stack is gone.
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Change Sets and Policies
Change Sets, Stack Policies and Deletion Controls