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I don't really know what steam backup does but the only way to change your save file is by doing it manually like this. If you already beat the game and you don't have an old manual save file saved somewhere then there is nothing you can do to reverse it.
If you only want to get the ending achievements then the best choice is to just get someone elses save file. There is plenty of people online giving their save files just for getting the different ending achievements (I think you can find it in steam guides here as well). Just make sure to save a copy of your original save file so that you can replace it back after getting the dfferent endings with someone elses saves.
This sounds like the way to go, i didnt consider being able to do that so thank you! Now i just need to find one haha