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To make my point I offer some statistics about the prices of external drives vs USB drives. Amazon sells a 32gb USB drive for $39 and a one terabyte exteral hard drive for $80. So divide 39/32 = $1.22 per gigabyte and divide 80/1000 = $0.08. The hard drive costs a lot less per gigabyte of drive space so the USB drive is really too expensive for backup.
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