02-01-2018 07:16 PM
03-01-2018 01:37 PM
I can't recall the specifics of Kies vs Smart Switch, but phone backups are seamless for both our A3s using Smart Switch.
You'll probably also find that message storage isn't taking up too much space in the grand scheme of things, but photos and videos could well be. Try playing around in the "My Files" section of the menu to see how much space is being taken up.