The only data that survives a civilization-level collapse is that which requires as little decoding as possible; in other words, plaintext. Future archaeologists aren't going to have a working copy of your GAN-based audio decoder. Translate your data into text (in as many major languages as possible), carve it into stone, and stuff it in a cave in the desert.
I would worry more about future archaeologists not being able to access e.g. Nvidia and TSMC engineering secrets than their ability to decode my cat pictures and shitty piano practice.
