I backup the rare/unreplacable media i have to a friend's home server fairly regularly, usually at the same time i pull in more
It'll be an absolute pain to get back if my main copy does die, but it gives me some peace of mind at least
I've thought about other copies on my own drives or cloud etc, but that's expensive
so it goes in the eternal Soon™ pile
Some of it I upload to the Internet Archive, but that requires some degree of curation/effort so I only do it for a few things.
but yes if there's something you've made or done or even just like, SAVE IT, you can't rely on the powers that be to keep it around for you
or even the non-powers that don't be (independent/smaller stuff)
i found an album I liked, but i couldn't buy it at that time, so I ripped it from the stream on the purchase page. later i come back with money, it is nowhere to be found. i email the band, and it turns out they broke up, so they're not selling it any more
so the copy I ripped is AFAIK the only way I can listen to it
save your shit