The safest long term storage media is to replace your updates on a regular basis. Keep an external back up hard drive or USB stick in a safe deposit box, and trade it out regularly. When one dies, replace it with the latest technology. When your computer dies, restore your data files from backups. That way, you're never dependent on old technology.
To be trite about it, proper backups are a journey, not a destination. You are never done with them.
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