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There is no 'perfect' storage device (or location).
Writable Optical Media is not the best as the internal dyes can deteriorate over time.
Rotating drives (or their electronics) can fail in long term storage (lack of use)
Use Alternate media Redundancy and off site storage of a COPY (Think Fire/Flood/Theft).
A climate controlled environment is also important. Not too Hot or not too Cold (near or below freezing).
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