The backlog only helps in prioritizing and cataloging the various tasks still left according to their importance. The Kanban board reflects the activities of the entire team whereas the backlog can be taken at every level. The backlog of the entire team would be larger than that of a small group or individual.What exactly is a Kanban board?
A Kanban board is a tool used to visualize the flow of work and enables a team to manage and optimize its processes. Kanban is the Japanese word for "visual card" or simply, "card". The Kanban method originated in the manufacturing industry when Toyota re-engineered its car manufacturing process.