How do i fix this data item saver?

here's the code:

local DataStoreService = game:GetService("DataStoreService")
local DataStore = DataStoreService:GetDataStore("Inventory") -- Separate variable

local function Load(plr)
    local key = "plr-"..plr.UserId -- key variable (The way I do it)
    local savedData -- Will be set below

    local success, err = pcall(function()
        -- This makes sure that the script will keep going if it errors
        savedData = DataStore:GetAsync(key) -- GetAsync()
    end  

    -- if datastore failed to read data
    if not success then
        warn("Failed to read data"..tostring(err))
        return -- this will return nil
    end

    -- if datastore succeeded 
    if savedData then
        -- if the player has data then load the data

        for i, v in pairs(savedData) do
            if v then
                local item = game.ServerStorage.Inventory:FindFirstChild(v):Clone()

                if item then
                    item.Parent = plr:WaitForChild("Backpack")
                end
            end
        end
    else
        -- If the player does not have data to be loaded

        local items = {}

        local itemsSaving = plr:WaitForChild("Backpack"):GetChildren()

        for i, v in pairs(itemsSaving) do
            if v then
                table.insert(items, v.Name)
            end
        end

        local success, err = pcall(function() -- protected call
            DataStore:SetAsync(key, items) -- SetAsync()
        end

        -- if overwriting data failed
        if not success then
            warn("Failed to overwrite data"..tostring(err))
            return
        end
    end
end

local function SaveData(plr)
    local key = "plr-"..plr.UserId -- Again just how I do it
    local items = {}

    local itemsSaving = plr:WaitForChild("Backpack"):GetChildren()

    for i, v in pairs(itemsSaving) do
        if v then
            table.insert(items, v.Name)
        end
    end

    local success, err = pcall(function()
        DataStore:SetAsync(key, items) -- SetAsync()
    end

    -- failed
    if not success then
        warn("Failed to overwrite data"..tostring(err))
        return
    end
end

-- Calls
game.Players.PlayerAdded:Connect(Load)
game.Players.PlayerRemoving:Connect(SaveData)

Can u test it guys? how doi fix this or rescript it?