Alright, so my computer's got quite a few years under it's

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Alright, so my computer's got quite a few years under it's belt, it makes occasional creaks and groans and does all the things you'd expect a computer that's getting a bit on in years to do. So I decided to do that thing that people much smarter than me do, and make a backup before it eventually shits itself.

I invested in an external hard drive that's got more than enough room, So now this has me thinking. I've got two drives, a D: drive that's my Steam folder and a bunch of video games and shit, things that I can easily redownload and reinstall. My C: drive is where my system settings, important programs, and beloved pictures/music are. So here's what I'm asking you :

Should I just back up my entire C: drive? Will that make it so I can just basically copy-paste unload that into a new computer that I eventually get and just get all my shit back, or is there more to it?