The Disk Usage plugin helps users manage and monitor the storage of their Obsidian vault by generating detailed reports on file sizes. It aggregates file sizes by folder and file type, providing visual summaries and graphs to identify space usage. This plugin is particularly useful for detecting large files, optimizing folder structures, and managing storage limits for syncing services. While it doesn't account for actual disk space influenced by metadata or hidden files like `.obsidian`, it provides accurate proportional size measurements based on Obsidian's API. Users can generate reports as markdown files and compare size changes over time.