How do I make it so the cash saves? Please help!

Hi, I made it so every 60 seconds or 1 minute, you get 50 cash, but It doesn't save, how do I use datastorage? pls help, thanks.

function onPlayerEntered(newPlayer)

	local stats = Instance.new("IntValue")
	stats.Name = "leaderstats"

	local cash = Instance.new("IntValue")
	cash.Name = "Cash"
	cash.Value = 100

	cash.Parent = stats
	stats.Parent = newPlayer
	while true do
		cash.Value = cash.Value + 50
		wait(60)
	end
end



game.Players.ChildAdded:connect(onPlayerEntered)

This is a pretty simple script I made for my game. In my game, I made it so it saves the minutes (currency) of the player on the leaderboard. Here's the script

function onPlayerEntered(player)
wait()-- Change to wait for player longer.
player:WaitForDataReady()
repeat wait() until player:FindFirstChild("leaderstats")
if player.DataReady then
if player:findFirstChild("leaderstats") then
local score = player.leaderstats:GetChildren()
for i = 1,#score do
local ScoreLoaded = player:LoadNumber(score[i].Name)
wait()
if ScoreLoaded ~= 0 then
score[i].Value = ScoreLoaded
end
end
end
end
end

function onPlayerLeaving(player)
if player:findFirstChild("leaderstats") then
local score = player.leaderstats:GetChildren()
for i = 1,#score do
player:SaveNumber(score[i].Name,score[i].Value)
end
end
end

game.Players.PlayerAdded:connect(onPlayerEntered)
game.Players.PlayerRemoving:connect(onPlayerLeaving)