If you are playing on PC, Renpy keeps your saves in a seperate folder, so just download the new version when it drops and when you hit load they'll be there.
I think there is a little more to the mobile version, Cari doesnt work on the android port though, but searching out how to transfer renpy saves on android should give you what you need to know, or other mobile players in the discord can tell you it will be opening back up to joining soon with the public release.