I made a saving thingy in my game. I wanna transfer it to something more modern like Data Stores because your not supposed to use it anymore, but I don't want people who bought stuff in my game to rage because they lost their stuff. If I can't transfer it, Save Instance is still okay, right?
to transfer it, you would need to do something like this:
when a player joins, if they have data on the old system, load it, then save it to the new system and set data persistence data to nil, otherwise check for data on the new system and load it as usual
This tutorial shows you how to save player's data through Data Stores:
http://wiki.roblox.com/index.php?title=Saving_Player_Data
I think you'll find this most helpful.