The scheduled backup will be triggered within 2 hours of the scheduled backup time. For example, If 100 VMs have their backup start time scheduled at 2:00 AM, then by 4:00 AM at the latest all the 100 VMs will have their backup job in progress. If scheduled backups have been paused because of an outage and resumed or retried, then the backup can start outside of this scheduled two-hour window.