Make sure that Wake-on-LAN is enabled on the target machines. Enter the machine BIOS and set Power -> Wake On PCI PME -> Power On. The exact names might vary depending on the BIOS version.
To enable the Wake-on-LAN feature on a machine running Windows, set the network adapter (NIC) properties on the machine as follows:
Select Control Panel -> System -> Device Manager -> Network adapters -> select the network adapter -> Properties -> Advanced:
The exact names of the controls may differ depending on your operating system.
If you cannot or do not wish to use Wake-on-LAN on some or all of the target machines, you will have to boot them into Acronis Snap Deploy 4 Agent manually before the scheduled time comes.