Windows 8.1 does not have an GUI tool to schedule a regular system image backup.
But there is a command line which could be placed to the task scheduler:
wbAdmin Start Backup -backupTarget:E: -include:C:,D:
Get the description of the wbAdmin command options by typing:
wbAdmin Start Backup /?
To restore the backup, first boot to the recovery partition. To do so on a healthy system (if the system is corrupted it should boot the recovery automatically) hold the Shift key when you click the "Reboot" button.