Burning CDRs is cheaper than manufacturing pressed discs and allows the producer to dynamically meet the exact demand with little-to-no waste. Given that so few people buy CDs anymore, we now see a higher percentage of CDRs being offered. Pressed CDs are generally deemed more reliable in the long-term due to less wear on data pits, but I'm not sure how that plays out these days.
Regardless of how they are made, it is always best to back up the content onto hard drives, or even better, SSDs.
Disclaimer: I am not a doctor, nor do I play one on TV. I do like to pretend that I am smart, though.
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