CashDataStore

local CashDataStore = game:GetService("DataStoreService"):GetDataStore("Cash")

game.Players.PlayerAdded:Connect(function(player)
    local previousData = CashDataStore:GetAsync(player.UserId)
    local Cash

    if previousData ~= nil then
        Cash = previousData
    else
        Cash = 0
        CashDataStore:SetAsync(player.UserId, Cash)
    end

    local CashValue = Instance.new("NumberValue", player)
    CashValue.Name = "Cash"
    CashValue.Value = Cash

end)

game:BindToClose(function()
    for i,player in pairs(game.Players:GetPlayers()) do
        local value = player.Cash.Value
        CashDataStore:SetAsync(player.UserId, value)
        print("Saved data for "..player.Name)
    end
end)

game.Players.PlayerRemoving:Connect(function(player)
    local value = player.Cash.Value

    if value ~= nil then
        print("Found data to save for "..player.Name.."!")
        CashDataStore:SetAsync(player.UserId, value)
        print("Saved data for "..player.Name)
    else
        print("Did not manage to find data to save for "..player.Name.."!")
    end
end)