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computers Best backup strategy/solution?

Hi I am a documentary filmmaker. just finished another project and stack with the same issue. how to backup all my rushes. I have something like 4TB for each project not included my offline avid media files that i want to keep. (and this is for HD projects now since I am filming in 4K it will be larger)
anyone with a working good strategy? how to keep it for years on hard drives that will be locked in a closet?
(brands and specs of hard drives will also be appreciated)