best way to back up files
Hi! Until recently, I have been using my Mac OS X for personal use. Internet and pictures pretty much. Now, I have a business and am trying to learn to fully use my laptop to support my business. I downloaded the El Capitan and have been a little lost since, learning as I go. I just bought an IPAD PRO and am learning how to use this as well. I just downloaded via ITunes a couple manuals that I am going to read and even am requesting "El Capitan for Dummies" from the library to read.
What is the best way to back up files? Do I need to get an external hard drive? If so, which one should I get? I recently signed up for the $0.99 a month ICLOUD and was thinking this is a back up for my files (folders containing work etc) but am thinking this is not the case after much research?
Please advise! Thanks!
MacBook, Mac OS X (10.6.6)