A virtual computer system includes a potential failure-causing event detection controller, a saving unit, and a snapshot creation unit. The potential failure-causing event detection controller detects a potential failure-causing event relating to a printer provided external to a virtual computer having installed thereon a guest operating system on which an application program is installed or relating to control of the printer. The saving unit performs a saving process of saving information indicating the potential failure-causing event and information about a page for which printing is not completed by the printer. The snapshot creation unit creates a snapshot of the guest operating system including the application program after the saving unit has performed the saving process.