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Tony Northrup (a former IT nerd and storage expert) teaches you how to properly backup your photos and videos because your external USB drive IS NOT ENOUGH! It's a good start, but it doesn't protect your photos and videos in the event of natural disasters (fire, flood) or theft. It also won't protect you from malware and ransomware.
He discusses cloud storage solutions, NAS (Network Attached Storage), including a description of his geographically distributed Synology DS1817+ configuration with over 400TB of storage in two different locations.
Tony also describes bitrot, which causes old files to gradually degrade even if they are backed up.