Honestly, I wasn't being specific. I like a specific music genre, and within this music genre some unique content was saved to DAT and Minidisc. The DATs were lost, and so the only available medium has been based on Minidisc.
In this case, I believe you are right: I don't think the data would've survived without minidisc. But in other circumstances where the user did not know minidisc is lossy?
In the end, a lot of these hidden gems have been (re)released because lost tapes (and, I suppose, HDDs) were found which is neat.