The word is Latin meaning to hold in one's hand. Maintenance is a hands on subject, an activity of direct contact.
All historic preservation is high class, responsible, thoughtful maintenance.
Like all preservation there are stages in the development of a plan for maintenance. A. Understand the materials, physical properties, and condition of the building that you wish to maintain. What is the condition of the system. B. Understand what is affecting the building negatively. Each building has its own different environment, created by the particular combination of negative effects upon it.