Best USB storage size to house an entire show file archive

Hi! 

I'm the technical director at my local theater and as part of Summer maintenance, I'd like to offload some shows into a show file archive to de-clutter our light boards. We have 3 different venues which each have years of shows stored in their respective boards. I'm wondering if anyone has a recommendation as to a USB GB amount which could store files for all three venues. 

Thanks! 

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