First thing, ditch your external drive and head for “the cloud.” You need to pick a cloud like Microsoft One Drive or iCloud. Another option is to explore CrashPlan – which is a little more serious, but well worth the time and effort if you have a lot of stuff you can’t afford to lose.
If you’re not into “a cloud” and need to back up your photos, try Google Photos. It saves your pics without you even having to think about it. And, like the cloud, it lets you access your shots from anywhere.