I've had certain personal data wiped from a hard drive many years ago, so I am a bit paranoid:
USB Thumb Drive for active files, 2 copies on External Hard Drives for long term storage (which I migrate once a year to new drives), and two physical copies of critical documents (legal, tax) kept in two locations (usually my parents house and a safe deposit box).
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I've had certain personal data wiped from a hard drive many years ago, so I am a bit paranoid:
USB Thumb Drive for active files, 2 copies on External Hard Drives for long term storage (which I migrate once a year to new drives), and two physical copies of critical documents (legal, tax) kept in two locations (usually my parents house and a safe deposit box).