How to back up to an external hard drive using rsync

Recently I've been getting myself more organised and focused with my business, and part of that process made me want to have a reliable back-up procedure in place for the work I do in creating my online courses. My case is that I have: a "master" folder on Dropbox in which I put all of my online business resources a "backup" folder on an external hard disk drive to which I want to replicate the...
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