How to save backpack even after resetting?

I was making a script that gives you a random power once you join, here is the code:

local Players = game:GetService("Players")


function onPlayerAdded(player)
	
local Quirks = game.ServerStorage.Quirks:GetChildren()
local RandomizeQuirks = math.random(1, #Quirks)
local QuirksChosen = Quirks[RandomizeQuirks]
print(QuirksChosen)
local quirk = QuirksChosen:Clone()
local backpack = player:WaitForChild("Backpack")
quirk.Parent = backpack

end
 
Players.PlayerAdded:connect(onPlayerAdded)
 
for _,player in pairs(Players:GetPlayers()) do
     onPlayerAdded(player)
end

But everytime the player resets or dies, they lose the power. Any way i can fix that error?