How do I clone my tool to a backpack?

I can clone my tool to the backpack but when I reset it will be gone someone said use a CharacterAdded but I have no idea how I should change my script to after I use CharacterAdded heres the script.

--Script made by WINDOWS10XPRO

--[[
	Title: KeyCardManagerScript
	Goal: Gives keycard to specific rank in a group when they join the server
	Description: This script is made by WINDOWS10XPRO. It's an open source. You can copy it if you want to.
]]--

--Variables:

local GroupID = 7495829 -- Your GroupID here
local ReplicatedStorage = game:GetService("ReplicatedStorage") -- ReplicatedStorage
local BlueKeyCard = ReplicatedStorage.BlueKeyCard -- Your Item
local YellowKeyCard = ReplicatedStorage.YellowKeyCard -- Your Item

--Ranks:
local Chairman = 255 -- Your rank number here
local President = 19 -- Your rank number here

--Scripts:

game.Players.PlayerAdded:Connect(function(Player) -- This line checks if a player has joined the server, and player is an argument.
	print(Player.Name .. " Has Joined The Server") -- Printing out the player's name in the Developer Console, press F9 if you're on pc.
	if Player:GetRankInGroup(GroupID) == President then -- Checks if the player's rank is President
		wait(1)
		local YellowKeyCardClone = YellowKeyCard:Clone() -- Set a variable to clone the keycard
		YellowKeyCardClone.Parent = Player:WaitForChild("Backpack") -- Set the keycard parent to the player's backpack
		local CheckKeyCardInBackpack = Player:WaitForChild("Backpack"):FindFirstChild("YellowKeyCardClone")
		if CheckKeyCardInBackpack then
			print("Succesfully added!")
		else
			print("Cloning failed!")
		end
	elseif Player:GetRankInGroup(GroupID) == Chairman then -- Checks if the player's rank is Chairman
		wait(1)
		local BlueKeyCardClone = BlueKeyCard:Clone() -- Set a variable to clone the keycard
		BlueKeyCardClone.Parent = Player:WaitForChild("Backpack")
		local CheckKeyCardInBackpack = Player:WaitForChild("Backpack"):FindFirstChild("BlueKeyCardClone")
		if CheckKeyCardInBackpack then
			print("Succesfully added!")
		else
			print("Cloning failed!")
		end
	else
		print("Did not join the group or don't have the rank requirement.")
	end
end)

I will be calm if someone helped me out, thanks!

The backpack always resets when the player's character loads, consider using it on the CharacterAdded signal.

local ReplicatedStorage = game:GetService("ReplicatedStorage")

local BlueKeyCard = ReplicatedStorage:WaitForChild("BlueKeyCard")
local YellowKeyCard = ReplicatedStorage:WaitForChild("YellowKeyCard")

local function OnPlayerAdded(player)
	print(string.format("%s has joined the server!", player.Name))
	player.CharacterAdded:Connect(function(Character)
		local Backpack
		repeat
			wait() 
		until player:FindFirstChildWhichIsA("Backpack")
		Backpack = player:FindFirstChildWhichIsA("Backpack")
		local Rank = player:GetRankInGroup(7495829)
		if Rank == 255 then
			local success, response = pcall(function()
				YellowKeyCard:Clone().Parent = Backpack
			end)
			if success == true then
				return print(string.format("Keycard was given to %s", player.Name))
			else
				return error(response)
			end
		elseif Rank == 19 then
			local success, response = pcall(function()
				BlueKeyCard:Clone().Parent = Backpack
			end)
			if success == true then
				return print(string.format("Keycard was given to %s", player.Name))
			else
				return error(response)
			end
		end
	end)
end

I fixed it, my script is basic not too advanced because im still a beginner here's the script anyways:

--Script made by WINDOWS10XPRO

--[[
	Title: KeyCardManagerScript
	Goal: Gives keycard to specific rank in a group when they join the 	server
	Description: This script is made by WINDOWS10XPRO. It's an open source. 	You can copy it if you want to.
]]--

--Variables:

local GroupID = 7495829 -- Your GroupID here
local ReplicatedStorage = game:GetService("ReplicatedStorage") -- ReplicatedStorage
local BlueKeyCard = ReplicatedStorage.BlueKeyCard -- Your Item
local YellowKeyCard = ReplicatedStorage.YellowKeyCard -- Your Item

--Ranks:
local Chairman = 255 -- Your rank number here
local President = 19 -- Your rank number here

--Scripts:

game.Players.PlayerAdded:Connect(function(Player) -- This line checks if a player has joined the server, and player is an argument.
	Player.CharacterAdded:Connect(function(Character)
		print(Player.Name .. " Has Joined The Server") -- Printing out the player's name in the Developer Console, press F9 if you're on pc.
		if Player:GetRankInGroup(GroupID) == President then -- Checks if the player's rank is President
			wait(1)
			local YellowKeyCardClone = YellowKeyCard:Clone() -- Set a variable to clone the keycard
			YellowKeyCardClone.Parent = Player:WaitForChild("Backpack") -- Set the keycard parent to the player's backpack
			local CheckKeyCardInBackpack = Player:WaitForChild("Backpack"):FindFirstChild("YellowKeyCardClone") -- Checks if the keycard is in the backpack
			wait(8)
			if CheckKeyCardInBackpack then -- If there is a keycard then it's successfully added 
				print("Succesfully added!")
			elseif not CheckKeyCardInBackpack then
				print("Cloning failed!") -- else it's not but for some reason it says cloning failed but it actually success
			end
			if Character.Humanoid.Health == 0 then
				wait(4.75)
				YellowKeyCardClone.Parent = Player:WaitForChild("Backpack") -- I was forced to do this ;-; bruh
			end
			
		elseif Player:GetRankInGroup(GroupID) == Chairman then -- Checks if the player's rank is Chairman
			wait(1)
			local BlueKeyCardClone = BlueKeyCard:Clone() -- Set a variable to clone the keycard
			BlueKeyCardClone.Parent = Player:WaitForChild("Backpack")
			local CheckKeyCardInBackpack = Player:WaitForChild("Backpack"):FindFirstChild("BlueKeyCardClone")
			wait(8)
			if CheckKeyCardInBackpack then
				print("Succesfully added!")
			elseif not CheckKeyCardInBackpack then
				print("Cloning failed!")
			end
			if Character.Humanoid.Health == 0 then
				wait(4.75)
				BlueKeyCardClone.Parent = Player:WaitForChild("Backpack") -- I was forced to do this ;-; bruh
			end
		else
			print("Did not join the group or doesn't met the group's rank requirement.")
		end
	end)
end)

you need to use CharacterAdded

it's at line 36. Hope this helps :D