My immediate concern with disc rot is if it's an eventuality that I will have to deal with sooner rather than much later.
If it's sooner, like within a couple of years from now for my older soundtracks, then there wouldn't be much of an incentive in collecting out of print soundtracks that are brand new, like new, or even in great condition. What would be the point in hunting down and collecting soundtracks in the best condition possible if the CD is going to rot sooner than expected? Well, unless the price difference between the various conditions is negligible.
I would also say that the integrity of the contents on a CD is a more important issue. It's much easier to notice that a CD will no longer play than it is to notice that the integrity of the contents on a CD have been compromised or at least it would be in my case.
My back up solution is pretty standard: Rip the CD in WAV format onto my desktop computer, and then after using a file archiving program (no compression) and obtaining a hash value, back it up once more on multiple external hard drives.
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