In JIRA, a sub-task is a smaller, more manageable piece of work that is part of a larger task or issue. Sub-tasks allow teams to break down complex tasks into smaller, more actionable items, making it easier to track progress and assign responsibilities. They are commonly used for breaking down user stories or epics into smaller tasks that can be completed independently.

The purpose of the JIRA Backup and Restore feature is to facilitate the migration of data between different JIRA instances. This feature allows users to create backups of their JIRA data, including projects, issues, configurations, and user data, and restore them onto another JIRA instance. It ensures that organizations can seamlessly transfer their data when upgrading to a new JIRA version or moving to a different environment.

When updating a JIRA plugin or add-on to a new version, it's crucial to ensure forward compatibility to ensure it functions correctly with the newer version of JIRA. This prevents potential issues and ensures smooth operation of the software.

In JIRA, a "filter" is essentially a saved search query that allows users to define specific criteria for retrieving issues from the system. Filters are closely related to reporting as they enable users to generate customized reports based on their search criteria, such as issues assigned to specific individuals, issues of certain types, or issues with particular statuses. By using filters, users can extract relevant data for reporting purposes, providing insights into project progress, team performance, and issue tracking.

Project categories in JIRA are used to organize projects into logical groups based on their purpose, department, or team. This helps users to easily navigate and find relevant projects within the JIRA instance.

The correct option is Option 4: Sprint Burndown. A burndown chart displays the amount of work remaining in a sprint. It is an essential tool for Agile teams to track their progress and ensure they are on track to meet their sprint goals.

To automatically transition issues to the "In Progress" status when assigned to a team member, you would configure an automation rule triggered by Issue Transition. This rule would initiate the transition whenever an issue moves from unassigned to assigned status.

Issue naming conventions play a crucial role in reporting and tracking progress by facilitating categorization. Consistently formatted names enable users to quickly identify the type, priority, and status of an issue, making it easier to generate accurate reports and monitor project progress effectively.

The "Project Key" in JIRA is a unique identifier assigned to each project, used in issue keys and project URLs. It is important because it helps in differentiating between projects, allowing for easier navigation and referencing within JIRA.

The "Sub-task" issue type in JIRA is typically used to represent a small, well-defined piece of work within a larger project. Sub-tasks are often used to break down larger tasks or user stories into more manageable sub-components, allowing for better tracking and management of work. They are commonly used to divide work among team members or to represent tasks that are required to complete a larger user story or task.

In JIRA, a project serves as a container for organizing and managing issues, which can represent tasks, bugs, features, or any other unit of work within the project.

A post-function in a JIRA workflow is an action that occurs after a transition is executed, such as sending notifications, updating fields, or triggering additional processes. It allows for automation and customization of workflow behavior based on specific events, enhancing the efficiency and effectiveness of the workflow. Understanding post-functions is important for configuring workflows to meet the specific needs of the project and team.