A maintenance backlog is a list of maintenance tasks that have been identified but not yet completed. It is used by maintenance professionals to prioritize and track work that needs to be done. Backlogs are typically organized by priority, with the most important tasks listed first. They can also be organized by type of task, such as preventive maintenance, corrective maintenance, or emergency maintenance. Backlogs are used to ensure that maintenance operations and management are able to efficiently and effectively manage their workload.