【VBA】重複データをバックグラウンドでPDF保存する方法

Option Explicit
Sub SaveDuplicateDataAsPDF()
    ' ワークシートオブジェクトの定義
    Dim ws As Worksheet
    Set ws = ThisWorkbook.Sheets("データ")
    
    ' 最終行の取得
    Dim lastRow As Long
    lastRow = ws.Cells(ws.Rows.Count, 1).End(xlUp).Row
    
    ' データ保存用配列
    Dim data() As Variant
    ReDim data(1 To lastRow - 1, 1 To 2)
    
    ' カウンタ変数
    Dim i As Long
    Dim j As Long
    j = 0
    
    Application.ScreenUpdating = False
    For i = 2 To lastRow
        If IsDuplicate(ws.Cells(i, 1).Value) Then
            j = j + 1
            data(j, 1) = ws.Cells(i, 1).Value
            data(j, 2) = ws.Cells(i, 2).Value
        End If
    Next i
    
    ' データ範囲の定義とPDF保存
    Dim rng As Range
    Set rng = ws.Range(ws.Cells(1, 1), ws.Cells(lastRow, 2))
    With rng
        .AutoFilter Field:=1, Criteria1:="<>", Operator:=xlAnd
        .SpecialCells(xlCellTypeVisible).Copy
        ThisWorkbook.Sheets.Add.Name = "TempSheet"
        Set rng = ThisWorkbook.Sheets("TempSheet")
        rng.PasteSpecial xlPasteValues
        With rng.Parent.PageSetup
            .PrintArea = rng.Address
            .FitToPagesWide = 1
            .FitToPagesTall = False
        End With
        ' PDF保存
        Application.DisplayAlerts = False
        rng.Parent.ExportAsFixedFormat Type:=xlTypePDF, Filename:="C:\Users\Public\Documents\DuplicateData.pdf", Quality:=xlQualityStandard, IncludeDocProperties:=True, IgnorePrintAreas:=False, OpenAfterPublish:=False
        Application.DisplayAlerts = True
    End With
    
    ' 一時シート削除
    ThisWorkbook.Sheets("TempSheet").Delete
    
    ' スクリーン更新再開
    Application.ScreenUpdating = True
End Sub

Function IsDuplicate(ByVal value As Variant) As Boolean
    Dim ws As Worksheet
    Set ws = ThisWorkbook.Sheets("データ")
    Dim lastRow As Long
    lastRow = ws.Cells(ws.Rows.Count, 1).End(xlUp).Row
    
    For i = 2 To lastRow - 1
        If ws.Cells(i, 1).Value = value Then IsDuplicate = True: Exit Function
    Next i
End Function