How can I make this save for the whole game, not just the server?

How would I make this actually save? At the moment it only saves in the server at the moment. How would I make it save, for the whole game?

game.Players.PlayerAdded:connect(function(player)
	local saveData = game.RobloxReplicatedStorage:FindFirstChild(player.Name)
	if not saveData then
		wait (1)
		local newSave = Instance.new ("Folder")
		newSave.Parent = game.RobloxReplicatedStorage
		newSave.Name = player.Name
		local coins = Instance.new ("NumberValue")
		coins.Name = "Coins"
		coins.Value = 0
		coins.Parent = newSave
		local diamonds = Instance.new("NumberValue")
		diamonds.Parent = newSave
		diamonds.Name = "Gems"
		diamonds.Value = 0
		local playersStats = player:FindFirstChild("leaderstats")
		local cash = playersStats:FindFirstChild("Coins")
		local gems = playersStats:FindFirstChild("Gems")
		cash.Value = coins.Value
		gems.Value = diamonds.Value
	else
		wait (1)
		local playerStats = player:FindFirstChild("leaderstats")
		local cash = playerStats:FindFirstChild ("Coins")
		local gems = playerStats:FindFirstChild("Gems")
		if cash then
			if gems then
				cash.Value = saveData.Coins.Value
				gems.Value = saveData.Gems.Value
				if player.Name == "jdc892" then
					cash.Value = cash.Value + 50
				end
			end
		end
		
	end
end)
 game.Players.PlayerRemoving:connect (function(player)
	local playerSave = game.RobloxReplicatedStorage:FindFirstChild(player.Name)
	if playerSave then
		local cashValue = playerSave:FindFirstChild("Cash")
		if cashValue then
			local gemsValue = playerSave:FindFirstChild("Gems")
			if gemsValue then
				local leaderStats = player:FindFirstChild ("leaderstats")
				if leaderStats then
					local playersCoins = leaderStats:FindFirstChild ("Coins")
					local playersGems = leaderStats:FindFirstChild ("Gems")
					if playersCoins then
						if playersGems then
							cashValue.Value = playersCoins.Value
							gemsValue.Value = playersGems.Value
						end
					end
				end
			end
		end
	end
end)