Maintenance Backlog is a list of maintenance tasks that need to be completed in order to keep a facility, system, or equipment in good working order. It is a record of all the maintenance activities that have been identified and need to be completed, but have not yet been scheduled or completed. Maintenance backlogs are typically managed by maintenance operations and management teams, who prioritize tasks based on urgency and importance. Maintenance backlogs can include preventive maintenance tasks, corrective maintenance tasks, and predictive maintenance tasks. They are an important tool for ensuring that maintenance activities are completed in a timely and efficient manner.