Which of the following tools can be used to back up individual files on a Windows machine?

File History is an effective tool for backing up individual files on a Windows machine. It allows users to automatically back up their files stored in libraries, desktop, favorites, and contacts. Users can set it up to run backups at regular intervals, ensuring that recent files are saved. The interface is user-friendly, allowing individuals to easily restore older versions of files or recover deleted files by browsing through different versions stored over time.

Disk Cleanup is primarily used to free up space on the hard drive by removing unnecessary files, such as temporary files and system files, rather than backing them up. System Restore focuses on creating restore points that can revert the entire system to a previous state, but it does not specifically back up individual files. Resource Monitor is a performance monitoring tool that provides real-time information on system resource usage and does not offer backup capabilities. Hence, File History stands out as the correct option for backing up individual files.