My ToolData Isn't being saved?

Basically, its not saving my data but I'm not sure why?

local ds = game:GetService("DataStoreService"):GetDataStore("Tools")

-- loading
game.Players.PlayerAdded:Connect(function(plr)
	local key = "id-"..plr.userId
	local success,tools = pcall(function()
		return ds:GetAsync(key)
	end)
	if  not success then
		error("not successful retrieving tooldata")
		
	else
		if not tools then return end
		for _, tool in pairs(tools) do
			local backpack = plr:WaitForChild("Backpack")
			local StarterGear = plr:WaitForChild("StarterGear")
			print(tool)
			if backpack and StarterGear then
				local toolInstance = game:GetService("ServerStorage").Tools:FindFirstChild(tool)
				if toolInstance then
					print(toolInstance)
					toolInstance:Clone().Parent = backpack
					toolInstance:Clone().Parent = StarterGear
				end
			end
		end
	end
	
end)



-- saving
game.Players.PlayerRemoving:connect(function(plr)
 local key = "id-"..plr.userId
 local char = plr.Character or plr.CharacterAdded:Wait()

 for _,tool in pairs(char:GetDescendants()) do
	 if tool:IsA("Tool") then
		 tool.Parent = plr.Backpack
	 end
 end

 local success, err = pcall(function()
  		local toolsToSave = {}
  		for i,v in pairs(plr.Backpack:GetChildren()) do
   			if v then
    			table.insert(toolsToSave,v.Name)
   			end
 		 end
		print(unpack(toolsToSave))
  		return ds:SetAsync(key,toolsToSave)
 	end)
	if err then
		print(err)
	end
end)