Sometimes just wiping the cache would be enough but it all depends on how many changes and what those changes are. If its a real minor change you won't have any issues but most update aren't just a few changes. It's always best to wipe data unless the developer tells you different.
You would need to use a different launcher to backup home screens and folders, try Nova launcher which is almost the same as stock with a few extra features like being able to backup then restore. Just Google Search Nova Launcher and you will find a download somewhere.