But we do have originals of many other texts. Like vast, vast amounts of cuneiform texts because they were usually pressed into a clay tablet and then baked.

All but four Mayan paper codices were burned, but the Mayans loved carving their stories into rocks and making those rocks part of their cities' architecture, so we still have a lot of their textual information. Same with the Egyptians- they wrote a lot on papyrus, and most of that is lost, but they also carved and painted all over tombs.

The secret is not to keep copying the texts. That introduces errors and those errors can compound. The secret is to preserve the texts in a medium which will only degrade over exceptionally long periods of time (compared to a human life, anyway).

If you had a device which could carve stored data into stone and make it retrievable again, you could potentially preserve that data for thousands of years.