I am no expert on this but from my niece who archives old movies at the National Archives, DVDs do not have a very long shelf life. DVDs are made up of three layers of plastic sandwiched together. Apparently over time the adhesive dries up and the layers separate. I believe the preferred method of film preservation is digitizing on hard drives and copying onto VHS film... there is probably new technology now that I do not know of but I at least wanted to mention the drawbacks of DVDs based on conversations with my niece. And possibly the DVD separation problem has been rectified by now.
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