I still use USB sticks for a variety of purposes. I also still use FTP

I stopped using Windows many, many years ago. The company behind it now runs a dubiously consensual "botnet" (C&C, RCE) called "Windows Update"

Dropbox as I understand it was a company that wanted people to store their personal files on someone else's computers

This is the antithesis of "self-hosting" which what the OP is about