Nothing wrong with rsync, it’s still kinda the shit. Short script, will do everything
https://git-annex.branchable.com/ this thing extends git to handling lots of big files. Probably a solid choice, haven’t tried, but it claims to do exactly what you need, and even has ui and partial sync
Nah he was saying he was okay with free versions of his app undercutting him before, but calling his paid version a scam caused him to reconsider the policy - threatens revenue