You'd need to have created the System Image yourself. It doesn't create itself. See here: https://www.howtogeek.com/howto/7363/macrium-reflect-is-a-free-and-easy-to-use-backup-utility/
System Restore is your first line of defense if Windows ever malfunctions as it can run even from recovery media to get you back before a problem started. It should always be turned on C drive with plenty of disk space (5-15%) configured. http://home.bt.com/tech-gadgets/computing/how-to-fix-windows-10-problems-with-system-restore-11364008291943