First of all, compress the audio. There's no need for extreme high fidelity in this case. V0/v2 mp3 is plenty of quality.
After that we're talking about 10s of gigabytes. If you want it to last as long as possible, I would upload to two separate cloud storage platforms, s3 glacier storage being one of them. Then make at least 2 physical copies, they can be flash media or blue ray DVD. Be sure to backup any passwords for the cloud providers ect..
192 is too low quality for music IMO. Fine for spoken word/audio books, though.