What does the System Restore command in Windows do?

The System Restore command in Windows is designed to restore your computer's system settings and configuration to a previous point in time, usually referred to as a restore point. This is especially useful in troubleshooting and recovering from issues that may arise after software installations, updates, or changes to system files that may negatively impact system performance or functionality.

When executed, System Restore rolls back the system settings to how they were at a specified date, effectively undoing any system changes made after that point while keeping personal files intact. This capability helps users recover from system instability without losing their documents and personal data.

The other options provided describe functionalities that are not associated with System Restore. For instance, returning deleted documents refers to file recovery procedures rather than system restoration. Improving computer performance typically involves optimization techniques rather than what the restore function directly achieves. Similarly, backing up files to an external drive signifies a backup process, which is different from the purpose of the System Restore command.