Yes, they would have to be responsible people, and copy over the save folder and screenshots like a normal person does (or even an Android user). If the phone people can learn to do it, surely anyone on a PC can learn to move a file.
Besides, anyone who depends on the backup save folder, is just asking for trouble. Something happen to windows, like a crash, and they are gone. Do you have any idea, how many times I have had to reinstall windows in the last 7 years since this game started? Be smart, keep things safe, not in a system folder.
Also, system folders are for system files, not games. All game stuff should go in the games folders/drives, where they belong. Makes things a lot easier to back up and transfer.