A method includes receiving an indication that an event has occurred in a physical space being monitored by a monitoring device that includes a plurality of sensors. In response to the indication, the method includes sending one or more primary notifications of the event over a computer-based network to each of one or more persons primarily associated with the physical space being monitored. If, after a designated amount of time, none of the primary notifications have been viewed by any of the persons primarily associated with the physical space being monitored, the method includes sending a backup notification of the event over the computer-based network to one or more persons designated as backup contacts. The backup notification is logically associated with information that the one or more backup contacts can access about the event. The logical association can be embodied by a link (e.g., a hyperlink) in the backup notification.