Use FergoBinXML to convert the file(s) to text first. Then you can change the settings with notepad and convert it back to XML and place it back in the folder. A backup is just a copy of your original file, so just copy the file you are going to edit BEFORE you start editting. If you have the diskspace for it just backup your whole F1 game directory, in that way you have everything original in case stuff goes wrong