Arguably, the most critical part of your computer is its storage where all your files are saved. It also impacts your computer’s performance and reliability. So it’s important to know the difference between an HDD and an SSD when buying a new computer, upgrading an old one, or getting a backup drive.
I have had my 500GB MacBook Pro for almost a year and it’t filling up quickly, and it’t time too offload some files. But to where? That’s how and why I got a new, but used, computer.