When updating from one format to another, you should generally write code to convert it. Once you have that code, it should be trivial to update old -> new form

When updating from one format to another, you should generally write code to convert it. Once you have that code, it should be trivial to update old -> new format by using all the intermediate software versions, or not as trivially, you can have a transformer from all previous versions to the current in your latest releases.