DataStore Tools Save Only Once?

I have a basic DataStore script, it's completely functional in saving tools. The only problem is that it only does it once. So if I go back in-game and grab a new tool, it will not save that tool. It's like the DataStore just stops after used once, and no longer registers any new tools.

local ds = game:GetService("DataStoreService"):GetDataStore("ToolSave")
game.Players.PlayerAdded:connect(function(plr)
 local key = "id-"..plr.userId
 pcall(function()
  local tools = ds:GetAsync(key)
  if tools then
   for i,v in pairs(tools) do
    local tool = game.ServerStorage.Tools:FindFirstChild(v)
    if tool then
     tool:Clone().Parent = plr:WaitForChild("Backpack")
     tool:Clone().Parent = plr:WaitForChild("StarterGear")
    end
   end
  end
 end)
end)
game.Players.PlayerRemoving:connect(function(plr)
 local key = "id-"..plr.userId
 pcall(function()
  local toolsToSave = {}
  for i,v in pairs(plr.Backpack:GetChildren()) do
   if v then
    table.insert(toolsToSave,v.Name)
   end
  end
  ds:SetAsync(key,toolsToSave)
 end)
end)

I am not asking for any scripts for DataStores, I just would like to know if there's a problem that I'm missing. I have the script in "ServerScriptService" and the tools folder in "ServerStorage."

Thank you.