What controls whether the Historian starts automatically when the computer restarts?

The AutoStart parameter is the correct choice as it specifically determines whether the AVEVA Historian Server will begin operation automatically upon system startup. This parameter is part of the configuration settings that dictate the behavior of the Historian in relation to the host system. When set to enable automatic startup, the Historian will launch whenever the computer is rebooted, ensuring the data collection process resumes without manual intervention.

While other options pertain to system management and execution configurations, they do not target the specific functionality of the Historian's automatic start. For instance, the startup mode setting can influence how services are started but does not directly control automatic initiation for the Historian specifically. Similarly, an automatic run command could refer to various types of commands set to execute on startup but lacks the specificity needed to ensure the Historian starts automatically. The system service configuration relates to the broader setup of services on the operating system but does not provide the particular toggle that the AutoStart parameter offers for the Historian.