Who was responsible for preserving the Five Classics in ancient times?

During the Spring and Autumn Period and the Warring States Period, the aristocratic class, that is, the class above scholars, enjoyed the right to study. The Five Classics was only established during the period of Emperor Wu of the Han Dynasty, so the books compiled by Confucius in the past were naturally compiled by Confucius' students. After Emperor Wu of the Han Dynasty, imperial academy was established in the central government, and Dr. Wu Jing was established. Of course, the most formal Five Classics was preserved in the imperial court at that time, but Confucianism had become orthodox at that time, and it was widely circulated in China, and there was no special person to preserve the Four Books and Five Classics. After the Han Dynasty, all the dynasties were similar. The Four Books and Five Classics were mainly circulated among the literati in the past dynasties, with copies and seals. There are no special people to save.