What types of files might leave behind “footprints” if a computer is not shut down gracefully?

When a computer does not shut down gracefully, various types of files can indeed leave behind "footprints," which refer to remnants of data or changes that were in process at the time of the shutdown. Autosave files are designed to automatically save data in the event of a system crash or unexpected shutdown, meaning that they can contain incomplete information or changes that were not finalized.

Print spooler files assist in managing printing tasks and may also contain incomplete print jobs that were being processed at the time of an abrupt shutdown. These files can also be recovered or inspected to see what was in the queue for printing.

Undo files serve a similar function in applications, allowing users to revert changes made during a session. If the system is shut down improperly, these files might not capture the latest state or changes, leading to additional data traces remaining.

Given that all these types of files can be affected in the event of an improper shutdown, it's accurate to conclude that they can all leave behind footprints. Therefore, the answer encompasses a holistic view of how different file types interact with system processes during a shutdown.