A Servant Leader is one who focuses primarily on the growth and well-being of people and the communities to which they belong. The servant-leader shares power, puts the needs of others first and helps people develop and perform as highly as possible. In the context of this question, a Servant Leader would work to ensure that the team has all the resources and knowledge they need to define the steps and identify the risks of migrating data to a new system1.
References: Essential Leadership Skills for Project Managers