I need to backup my computer files to another computer or device that is in the same country as I am. Would prefer an open-source or free option for the backups.
This would need to work for multiple computers using both Mac and Windows.
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Depending on how many files and folders need backing up, your might be best using a external hard drive with a calendar reminder every month to backup the files. This would be the simplest and cheapest option for you and could work on all platforms.
You could also try a local IT provider and ask if the data is stored in the same country, but this option wouldn't be free but would be well managed.
There's always Resilio Sync - the free tier already grants enough possibilities and kan keep the files on your LAN if you so desire.
If you really want to stay open source, try Syncthing - it is CLI only but as far as I can tell it has some GUI wrappers you can download along. I am actually planning on moving to it from Resilio.
The method is generally that you set up a folder to sync, and then you can get a key which then can be fed to a different PC on your LAN (with a drive attached for backup or whatever) so it will make copy of the folder there. Mostly seamless although sometimes it locks up a file or two for longer than it should - I tend to turn it off whenever I work in Visual Studio for example.