Yeah, from my understanding the rot is literally a fungus/bacteria colony that eats the dye. If you store the 3 copies separately in sealed containers, regular

Yeah, from my understanding the rot is literally a fungus/bacteria colony that eats the dye. If you store the 3 copies separately in sealed containers, regular (no worse than yearly) inspections should probably suffice. The damage is visible; if anything looks off, put it back and immediately organize preemptive data rescue. This can be obvious discoloration (likely with a gradient) or discrete specs, the latter can also happen to BD-R HTL where they are "just" delamination. That is thankfully a fairly slow progressive effect from AFAIK the acrylic glue slowly hydrolyzing, and can be counteracted by cold constant-temperature constant-low-humidity storage (an office cabinet with AC is better than a finished basement w/o AC).