Not trying to go too much off-topic (even if this IS the Coffee House! LOL), but there are some theories out there that have scientific merit and a few political ones that, if they happen, we might not be caring much about our saved songs (pole shift, increased solar flare activity, intentionally created WWIII, UN Agenda 21, etc.).
That said, I think you can only give it your best effort. Note that this is coming from a guy who bought a Panasonic PD (Phase Digital) writer when they first came out because the media was supposed to keep your data safe for 30 years. I had all my tunes, projects and notes for the future on one disk securely locked in a fire-proof, water-proof safe. Then my main computer died thanks to lightning hitting a transformer right outside my apartment, taking the hard drives with it. After buying and setting up a new computer, I then tried to restore my saved work only to find that: A) my PD drive had also been fried, B) they weren't being made any more, and C) data recovery businesses didn't have one either... Now I have (what little I have left) saved in multiple places, including the cloud, but primarily on a "frozen in time" server running Windows XP and SONAR Producer 4 that isn't connected to the internet. *Sigh...*
So, my recommendation is to not only keep the projects and audio, but keep all of the details separately using spreadsheets or other documents (with printed copies) so that you can recreate things from scratch if the World gets turned up on its head and the new storage medium includes three dimensional placement in crystals (the supposed "Record Keepers" from Atlantis). ?