The Packrat plugin helps manage completed recurring tasks within an Obsidian vault by automatically organizing them based on user-defined triggers. It offers three actions for completed tasks: moving them to the bottom of the current note, archiving them in a separate file, or deleting them. The plugin allows users to configure custom triggers, such as tags, emojis, or text strings, to specify the desired action. It enhances task management by keeping notes clutter-free and ensuring important records are archived efficiently.