I agree with those that say Inkscape, it’s where I’ve designed all my logos. However, I’ve been tempted to try using FreeCAD to do it lately. I’m not sure if it can export as SVG, but the thought of have a proper parametric tool for designing logos sounds up my ally. I tend to try to treat Inkscape like one, by liberal use of construction lines, but at the end of the day, it really doesn’t like being that precise.
I moved to syncthing a long time ago. I run it on all my computers, my phone, and my NAS. Keeps everything in sync and local. My only worry is the lack of an offsite. If my home burned down, I’d be a little screwed. Otherwise, I’ve got lots of copies on lots of devices, as well as automatic backups.