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

And windows could originally fit on five 5.25" disks.

Re Dropbox: https://news.ycombinator.com/item?id=9224