How to back up family and house?

Hi,

I am about to re-install my game but I dont want to lose my family and house, is there a way to save it and then load it? I read something about it, that in My Documents/EA/TS4/saved are two files that I should copy, but I have there like 10 files very similar to each other so I dont know which one to copy.

Thanks for any answer.