Global extinction level event, all our culture lost, but we want to keep a record of what we were doing. A library of Alexandria built in this age would contain much computer code. How to archive it in a format that's likely to be understood by future civilizations ?
An idea is a tool is an idea. Or an idea is a description of a tool. In any case, code is a history of our time. A computed history. It encodes the way we thought about things, reflected in the way we arranged our systems of doing things. There's an argument to be made that it is a highly efficient description -- it might be possible to accurately rebuild a fallen civilization if we could read its computer code. At the very least, we'd have a start on rebuilding its infrastructure. The writings of a time encode its culture, you can rebuild a culture from that. The Renaissance did this with the culture of ancient Greece and Rome. Code is a medium, of today. It works to save that, if we value the preservation of our time.