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If you are wanting to keep them offline, then optical drives for mine would have the highest longevity (it may not be the case, my system is light on caffeine today). Technological advances are the stumbling point with this thinking though, and unless you keep a device with the stored files, then retrieving them will be a job in itself. Even then, compatible ports would not be guaranteed at any given time.
As for functional and accessible storage that you have full control over, then a RAID system as you mentioned, would be my preference.
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