Syncthing, it was made exactly for situations like this. And unlike DropBox etc your data stays local.
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Svn? It's not 2002 anymore.
Onedrive or dropbox would work well. Otherwise if you want source control, git would be the way to go.
SVN is still awesome and in some ways superior to 2024 solutions. It also excels at some things more than others, just as GIT.
On the "but it's old" thought: Dropbox is a 2007 solution which still lives in 2024, thus living many years. Like Subversion. Oh, and GIT was created in 2005. So...
Don't have the time to detail that now myself, but here's two articles for those who are looking for more than a personal opinion on the topic:
Don't get me started on the Linux kernel😂I hate that argument but it's old on software. If it's still maintained and maybe even actively developed that's way better than a new project
Svn is perfect for this kind of thing. Git is great if you have lots of teams working together, but for a single user, git doesn't really provide any benefits.
That said, there are plenty of other options that are more modern, but if you are comfortable with SVN, I don't see a reason to not use it.
I'm not a windows guy, but I sync a lot of my files with NextCloud. It's free, and I'm sure someone has a way to do it seamlessly with Windows. Maybe a VirtualBox VM with NextCloud in it? Is there a Windows implementation of Syncthing? Those would be what I'd try.
I would be careful of any automated solution. It's possible to get a sync conflict, and either two programs write to the same file and corrupt it, or one decides its version is newer when it isn't, or any number of things.
The safest thing to do would be to designate one of them to play the game, then use a remote tool like steam's remote play so you're actually always only playing on one computer.
You could also link over the network with SMB to share the save location, but that also has conflict problems, because if you forget to close the game after playing for a few hours on the other, and save the first one, you've lost that progress.
If you wanted manual control to avoid that, git honestly isn't a bad option. Plus, you get versioning for free.