diff --git a/src/PhpSpreadsheet/Writer/Xlsx.php b/src/PhpSpreadsheet/Writer/Xlsx.php
index bfcde049..4cb10287 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx.php
@@ -107,6 +107,13 @@ class Xlsx extends BaseWriter
      */
     private $drawingHashTable;
 
+    /**
+     * Private handle for zip stream.
+     *
+     * @var ZipStream
+     */
+    private $zip;
+
     /**
      * Create a new Xlsx Writer.
      */
@@ -173,6 +180,7 @@ class Xlsx extends BaseWriter
     {
         if ($this->spreadSheet !== null) {
             // garbage collect
+            $this->pathNames = [];
             $this->spreadSheet->garbageCollect();
 
             $this->openFileHandle($pFilename);
@@ -203,73 +211,73 @@ class Xlsx extends BaseWriter
             $options->setEnableZip64(false);
             $options->setOutputStream($this->fileHandle);
 
-            $zip = new ZipStream(null, $options);
+            $this->zip = new ZipStream(null, $options);
 
             // Add [Content_Types].xml to ZIP file
-            $zip->addFile('[Content_Types].xml', $this->getWriterPart('ContentTypes')->writeContentTypes($this->spreadSheet, $this->includeCharts));
+            $this->addZipFile('[Content_Types].xml', $this->getWriterPart('ContentTypes')->writeContentTypes($this->spreadSheet, $this->includeCharts));
 
             //if hasMacros, add the vbaProject.bin file, Certificate file(if exists)
             if ($this->spreadSheet->hasMacros()) {
                 $macrosCode = $this->spreadSheet->getMacrosCode();
                 if ($macrosCode !== null) {
                     // we have the code ?
-                    $zip->addFile('xl/vbaProject.bin', $macrosCode); //allways in 'xl', allways named vbaProject.bin
+                    $this->addZipFile('xl/vbaProject.bin', $macrosCode); //allways in 'xl', allways named vbaProject.bin
                     if ($this->spreadSheet->hasMacrosCertificate()) {
                         //signed macros ?
                         // Yes : add the certificate file and the related rels file
-                        $zip->addFile('xl/vbaProjectSignature.bin', $this->spreadSheet->getMacrosCertificate());
-                        $zip->addFile('xl/_rels/vbaProject.bin.rels', $this->getWriterPart('RelsVBA')->writeVBARelationships($this->spreadSheet));
+                        $this->addZipFile('xl/vbaProjectSignature.bin', $this->spreadSheet->getMacrosCertificate());
+                        $this->addZipFile('xl/_rels/vbaProject.bin.rels', $this->getWriterPart('RelsVBA')->writeVBARelationships($this->spreadSheet));
                     }
                 }
             }
             //a custom UI in this workbook ? add it ("base" xml and additional objects (pictures) and rels)
             if ($this->spreadSheet->hasRibbon()) {
                 $tmpRibbonTarget = $this->spreadSheet->getRibbonXMLData('target');
-                $zip->addFile($tmpRibbonTarget, $this->spreadSheet->getRibbonXMLData('data'));
+                $this->addZipFile($tmpRibbonTarget, $this->spreadSheet->getRibbonXMLData('data'));
                 if ($this->spreadSheet->hasRibbonBinObjects()) {
                     $tmpRootPath = dirname($tmpRibbonTarget) . '/';
                     $ribbonBinObjects = $this->spreadSheet->getRibbonBinObjects('data'); //the files to write
                     foreach ($ribbonBinObjects as $aPath => $aContent) {
-                        $zip->addFile($tmpRootPath . $aPath, $aContent);
+                        $this->addZipFile($tmpRootPath . $aPath, $aContent);
                     }
                     //the rels for files
-                    $zip->addFile($tmpRootPath . '_rels/' . basename($tmpRibbonTarget) . '.rels', $this->getWriterPart('RelsRibbonObjects')->writeRibbonRelationships($this->spreadSheet));
+                    $this->addZipFile($tmpRootPath . '_rels/' . basename($tmpRibbonTarget) . '.rels', $this->getWriterPart('RelsRibbonObjects')->writeRibbonRelationships($this->spreadSheet));
                 }
             }
 
             // Add relationships to ZIP file
-            $zip->addFile('_rels/.rels', $this->getWriterPart('Rels')->writeRelationships($this->spreadSheet));
-            $zip->addFile('xl/_rels/workbook.xml.rels', $this->getWriterPart('Rels')->writeWorkbookRelationships($this->spreadSheet));
+            $this->addZipFile('_rels/.rels', $this->getWriterPart('Rels')->writeRelationships($this->spreadSheet));
+            $this->addZipFile('xl/_rels/workbook.xml.rels', $this->getWriterPart('Rels')->writeWorkbookRelationships($this->spreadSheet));
 
             // Add document properties to ZIP file
-            $zip->addFile('docProps/app.xml', $this->getWriterPart('DocProps')->writeDocPropsApp($this->spreadSheet));
-            $zip->addFile('docProps/core.xml', $this->getWriterPart('DocProps')->writeDocPropsCore($this->spreadSheet));
+            $this->addZipFile('docProps/app.xml', $this->getWriterPart('DocProps')->writeDocPropsApp($this->spreadSheet));
+            $this->addZipFile('docProps/core.xml', $this->getWriterPart('DocProps')->writeDocPropsCore($this->spreadSheet));
             $customPropertiesPart = $this->getWriterPart('DocProps')->writeDocPropsCustom($this->spreadSheet);
             if ($customPropertiesPart !== null) {
-                $zip->addFile('docProps/custom.xml', $customPropertiesPart);
+                $this->addZipFile('docProps/custom.xml', $customPropertiesPart);
             }
 
             // Add theme to ZIP file
-            $zip->addFile('xl/theme/theme1.xml', $this->getWriterPart('Theme')->writeTheme($this->spreadSheet));
+            $this->addZipFile('xl/theme/theme1.xml', $this->getWriterPart('Theme')->writeTheme($this->spreadSheet));
 
             // Add string table to ZIP file
-            $zip->addFile('xl/sharedStrings.xml', $this->getWriterPart('StringTable')->writeStringTable($this->stringTable));
+            $this->addZipFile('xl/sharedStrings.xml', $this->getWriterPart('StringTable')->writeStringTable($this->stringTable));
 
             // Add styles to ZIP file
-            $zip->addFile('xl/styles.xml', $this->getWriterPart('Style')->writeStyles($this->spreadSheet));
+            $this->addZipFile('xl/styles.xml', $this->getWriterPart('Style')->writeStyles($this->spreadSheet));
 
             // Add workbook to ZIP file
-            $zip->addFile('xl/workbook.xml', $this->getWriterPart('Workbook')->writeWorkbook($this->spreadSheet, $this->preCalculateFormulas));
+            $this->addZipFile('xl/workbook.xml', $this->getWriterPart('Workbook')->writeWorkbook($this->spreadSheet, $this->preCalculateFormulas));
 
             $chartCount = 0;
             // Add worksheets
             for ($i = 0; $i < $this->spreadSheet->getSheetCount(); ++$i) {
-                $zip->addFile('xl/worksheets/sheet' . ($i + 1) . '.xml', $this->getWriterPart('Worksheet')->writeWorksheet($this->spreadSheet->getSheet($i), $this->stringTable, $this->includeCharts));
+                $this->addZipFile('xl/worksheets/sheet' . ($i + 1) . '.xml', $this->getWriterPart('Worksheet')->writeWorksheet($this->spreadSheet->getSheet($i), $this->stringTable, $this->includeCharts));
                 if ($this->includeCharts) {
                     $charts = $this->spreadSheet->getSheet($i)->getChartCollection();
                     if (count($charts) > 0) {
                         foreach ($charts as $chart) {
-                            $zip->addFile('xl/charts/chart' . ($chartCount + 1) . '.xml', $this->getWriterPart('Chart')->writeChart($chart, $this->preCalculateFormulas));
+                            $this->addZipFile('xl/charts/chart' . ($chartCount + 1) . '.xml', $this->getWriterPart('Chart')->writeChart($chart, $this->preCalculateFormulas));
                             ++$chartCount;
                         }
                     }
@@ -280,19 +288,19 @@ class Xlsx extends BaseWriter
             // Add worksheet relationships (drawings, ...)
             for ($i = 0; $i < $this->spreadSheet->getSheetCount(); ++$i) {
                 // Add relationships
-                $zip->addFile('xl/worksheets/_rels/sheet' . ($i + 1) . '.xml.rels', $this->getWriterPart('Rels')->writeWorksheetRelationships($this->spreadSheet->getSheet($i), ($i + 1), $this->includeCharts));
+                $this->addZipFile('xl/worksheets/_rels/sheet' . ($i + 1) . '.xml.rels', $this->getWriterPart('Rels')->writeWorksheetRelationships($this->spreadSheet->getSheet($i), ($i + 1), $this->includeCharts));
 
                 // Add unparsedLoadedData
                 $sheetCodeName = $this->spreadSheet->getSheet($i)->getCodeName();
                 $unparsedLoadedData = $this->spreadSheet->getUnparsedLoadedData();
                 if (isset($unparsedLoadedData['sheets'][$sheetCodeName]['ctrlProps'])) {
                     foreach ($unparsedLoadedData['sheets'][$sheetCodeName]['ctrlProps'] as $ctrlProp) {
-                        $zip->addFile($ctrlProp['filePath'], $ctrlProp['content']);
+                        $this->addZipFile($ctrlProp['filePath'], $ctrlProp['content']);
                     }
                 }
                 if (isset($unparsedLoadedData['sheets'][$sheetCodeName]['printerSettings'])) {
                     foreach ($unparsedLoadedData['sheets'][$sheetCodeName]['printerSettings'] as $ctrlProp) {
-                        $zip->addFile($ctrlProp['filePath'], $ctrlProp['content']);
+                        $this->addZipFile($ctrlProp['filePath'], $ctrlProp['content']);
                     }
                 }
 
@@ -305,13 +313,13 @@ class Xlsx extends BaseWriter
                 // Add drawing and image relationship parts
                 if (($drawingCount > 0) || ($chartCount > 0)) {
                     // Drawing relationships
-                    $zip->addFile('xl/drawings/_rels/drawing' . ($i + 1) . '.xml.rels', $this->getWriterPart('Rels')->writeDrawingRelationships($this->spreadSheet->getSheet($i), $chartRef1, $this->includeCharts));
+                    $this->addZipFile('xl/drawings/_rels/drawing' . ($i + 1) . '.xml.rels', $this->getWriterPart('Rels')->writeDrawingRelationships($this->spreadSheet->getSheet($i), $chartRef1, $this->includeCharts));
 
                     // Drawings
-                    $zip->addFile('xl/drawings/drawing' . ($i + 1) . '.xml', $this->getWriterPart('Drawing')->writeDrawings($this->spreadSheet->getSheet($i), $this->includeCharts));
+                    $this->addZipFile('xl/drawings/drawing' . ($i + 1) . '.xml', $this->getWriterPart('Drawing')->writeDrawings($this->spreadSheet->getSheet($i), $this->includeCharts));
                 } elseif (isset($unparsedLoadedData['sheets'][$sheetCodeName]['drawingAlternateContents'])) {
                     // Drawings
-                    $zip->addFile('xl/drawings/drawing' . ($i + 1) . '.xml', $this->getWriterPart('Drawing')->writeDrawings($this->spreadSheet->getSheet($i), $this->includeCharts));
+                    $this->addZipFile('xl/drawings/drawing' . ($i + 1) . '.xml', $this->getWriterPart('Drawing')->writeDrawings($this->spreadSheet->getSheet($i), $this->includeCharts));
                 }
 
                 // Add unparsed drawings
@@ -320,7 +328,7 @@ class Xlsx extends BaseWriter
                         $drawingFile = array_search($relId, $unparsedLoadedData['sheets'][$sheetCodeName]['drawingOriginalIds']);
                         if ($drawingFile !== false) {
                             $drawingFile = ltrim($drawingFile, '.');
-                            $zip->addFile('xl' . $drawingFile, $drawingXml);
+                            $this->addZipFile('xl' . $drawingFile, $drawingXml);
                         }
                     }
                 }
@@ -328,30 +336,30 @@ class Xlsx extends BaseWriter
                 // Add comment relationship parts
                 if (count($this->spreadSheet->getSheet($i)->getComments()) > 0) {
                     // VML Comments
-                    $zip->addFile('xl/drawings/vmlDrawing' . ($i + 1) . '.vml', $this->getWriterPart('Comments')->writeVMLComments($this->spreadSheet->getSheet($i)));
+                    $this->addZipFile('xl/drawings/vmlDrawing' . ($i + 1) . '.vml', $this->getWriterPart('Comments')->writeVMLComments($this->spreadSheet->getSheet($i)));
 
                     // Comments
-                    $zip->addFile('xl/comments' . ($i + 1) . '.xml', $this->getWriterPart('Comments')->writeComments($this->spreadSheet->getSheet($i)));
+                    $this->addZipFile('xl/comments' . ($i + 1) . '.xml', $this->getWriterPart('Comments')->writeComments($this->spreadSheet->getSheet($i)));
                 }
 
                 // Add unparsed relationship parts
                 if (isset($unparsedLoadedData['sheets'][$sheetCodeName]['vmlDrawings'])) {
                     foreach ($unparsedLoadedData['sheets'][$sheetCodeName]['vmlDrawings'] as $vmlDrawing) {
-                        $zip->addFile($vmlDrawing['filePath'], $vmlDrawing['content']);
+                        $this->addZipFile($vmlDrawing['filePath'], $vmlDrawing['content']);
                     }
                 }
 
                 // Add header/footer relationship parts
                 if (count($this->spreadSheet->getSheet($i)->getHeaderFooter()->getImages()) > 0) {
                     // VML Drawings
-                    $zip->addFile('xl/drawings/vmlDrawingHF' . ($i + 1) . '.vml', $this->getWriterPart('Drawing')->writeVMLHeaderFooterImages($this->spreadSheet->getSheet($i)));
+                    $this->addZipFile('xl/drawings/vmlDrawingHF' . ($i + 1) . '.vml', $this->getWriterPart('Drawing')->writeVMLHeaderFooterImages($this->spreadSheet->getSheet($i)));
 
                     // VML Drawing relationships
-                    $zip->addFile('xl/drawings/_rels/vmlDrawingHF' . ($i + 1) . '.vml.rels', $this->getWriterPart('Rels')->writeHeaderFooterDrawingRelationships($this->spreadSheet->getSheet($i)));
+                    $this->addZipFile('xl/drawings/_rels/vmlDrawingHF' . ($i + 1) . '.vml.rels', $this->getWriterPart('Rels')->writeHeaderFooterDrawingRelationships($this->spreadSheet->getSheet($i)));
 
                     // Media
                     foreach ($this->spreadSheet->getSheet($i)->getHeaderFooter()->getImages() as $image) {
-                        $zip->addFile('xl/media/' . $image->getIndexedFilename(), file_get_contents($image->getPath()));
+                        $this->addZipFile('xl/media/' . $image->getIndexedFilename(), file_get_contents($image->getPath()));
                     }
                 }
             }
@@ -374,7 +382,7 @@ class Xlsx extends BaseWriter
                         $imageContents = file_get_contents($imagePath);
                     }
 
-                    $zip->addFile('xl/media/' . str_replace(' ', '_', $this->getDrawingHashTable()->getByIndex($i)->getIndexedFilename()), $imageContents);
+                    $this->addZipFile('xl/media/' . str_replace(' ', '_', $this->getDrawingHashTable()->getByIndex($i)->getIndexedFilename()), $imageContents);
                 } elseif ($this->getDrawingHashTable()->getByIndex($i) instanceof MemoryDrawing) {
                     ob_start();
                     call_user_func(
@@ -384,7 +392,7 @@ class Xlsx extends BaseWriter
                     $imageContents = ob_get_contents();
                     ob_end_clean();
 
-                    $zip->addFile('xl/media/' . str_replace(' ', '_', $this->getDrawingHashTable()->getByIndex($i)->getIndexedFilename()), $imageContents);
+                    $this->addZipFile('xl/media/' . str_replace(' ', '_', $this->getDrawingHashTable()->getByIndex($i)->getIndexedFilename()), $imageContents);
                 }
             }
 
@@ -393,7 +401,7 @@ class Xlsx extends BaseWriter
 
             // Close file
             try {
-                $zip->finish();
+                $this->zip->finish();
             } catch (OverflowException $e) {
                 throw new WriterException('Could not close resource.');
             }
@@ -535,4 +543,14 @@ class Xlsx extends BaseWriter
 
         return $this;
     }
+
+    private $pathNames = [];
+
+    private function addZipFile(string $path, string $content): void
+    {
+        if (!in_array($path, $this->pathNames)) {
+            $this->pathNames[] = $path;
+            $this->zip->addFile($path, $content);
+        }
+    }
 }
diff --git a/tests/PhpSpreadsheetTests/Writer/Xlsx/UnparsedDataCloneTest.php b/tests/PhpSpreadsheetTests/Writer/Xlsx/UnparsedDataCloneTest.php
new file mode 100644
index 00000000..d2afb423
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Writer/Xlsx/UnparsedDataCloneTest.php
@@ -0,0 +1,101 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Writer\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\Settings;
+use PhpOffice\PhpSpreadsheet\Shared\File;
+use PHPUnit\Framework\TestCase;
+
+class UnparsedDataCloneTest extends TestCase
+{
+    /**
+     * Test load and save Xlsx file with unparsed data (form elements, protected sheets, alternate contents, printer settings,..).
+     */
+    public function testLoadSaveXlsxWithUnparsedDataClone(): void
+    {
+        $sampleFilename = 'tests/data/Writer/XLSX/drawing_on_2nd_page.xlsx';
+        $resultFilename = tempnam(File::sysGetTempDir(), 'phpspreadsheet-test');
+        Settings::setLibXmlLoaderOptions(null); // reset to default options
+        $reader = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
+        $spreadsheet = $reader->load($sampleFilename);
+        $spreadsheet->setActiveSheetIndex(1);
+        $sheet = $spreadsheet->getActiveSheet();
+        $drawings = $sheet->getDrawingCollection();
+        self::assertCount(1, $drawings);
+        $sheetCodeName = $sheet->getCodeName();
+        $unparsedLoadedData = $spreadsheet->getUnparsedLoadedData();
+        self::assertArrayHasKey('printerSettings', $unparsedLoadedData['sheets'][$sheetCodeName]);
+        self::assertCount(1, $unparsedLoadedData['sheets'][$sheetCodeName]['printerSettings']);
+
+        $clonedSheet = clone $spreadsheet->getActiveSheet();
+        $clonedSheet->setTitle('Clone');
+        $spreadsheet->addSheet($clonedSheet);
+
+        $writer = new \PhpOffice\PhpSpreadsheet\Writer\Xlsx($spreadsheet);
+        $writer->save($resultFilename);
+        $dupname = 'Unable to open saved file';
+        $zip = zip_open($resultFilename);
+        if (is_resource($zip)) {
+            $names = [];
+            $dupname = '';
+            while ($zip_entry = zip_read($zip)) {
+                $zipname = zip_entry_name($zip_entry);
+                if (in_array($zipname, $names)) {
+                    $dupname .= "$zipname,";
+                } else {
+                    $names[] = $zipname;
+                }
+            }
+            zip_close($zip);
+        }
+        unlink($resultFilename);
+        self::assertEquals('', $dupname);
+    }
+
+    /**
+     * Test that saving twice with same writer works.
+     */
+    public function testSaveTwice(): void
+    {
+        $sampleFilename = 'tests/data/Writer/XLSX/drawing_on_2nd_page.xlsx';
+        $resultFilename1 = tempnam(File::sysGetTempDir(), 'phpspreadsheet-test1');
+        $resultFilename2 = tempnam(File::sysGetTempDir(), 'phpspreadsheet-test2');
+        self::assertNotEquals($resultFilename1, $resultFilename2);
+        Settings::setLibXmlLoaderOptions(null); // reset to default options
+        $reader = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
+        $spreadsheet = $reader->load($sampleFilename);
+        $sheet = $spreadsheet->setActiveSheetIndex(1);
+        $sheet->setTitle('Original');
+
+        $clonedSheet = clone $spreadsheet->getActiveSheet();
+        $clonedSheet->setTitle('Clone');
+        $spreadsheet->addSheet($clonedSheet);
+        $clonedSheet->getCell('A8')->setValue('cloned');
+        $sheet->getCell('A8')->setValue('original');
+
+        $writer = new \PhpOffice\PhpSpreadsheet\Writer\Xlsx($spreadsheet);
+        $writer->save($resultFilename1);
+        $reader1 = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
+        $spreadsheet1 = $reader1->load($resultFilename1);
+        unlink($resultFilename1);
+        $sheet1c = $spreadsheet1->getSheetByName('Clone');
+        $sheet1o = $spreadsheet1->getSheetByName('Original');
+
+        $writer->save($resultFilename2);
+        $reader2 = new \PhpOffice\PhpSpreadsheet\Reader\Xlsx();
+        $spreadsheet2 = $reader2->load($resultFilename2);
+        unlink($resultFilename2);
+        $sheet2c = $spreadsheet2->getSheetByName('Clone');
+        $sheet2o = $spreadsheet2->getSheetByName('Original');
+
+        self::assertEquals($spreadsheet1->getSheetCount(), $spreadsheet2->getSheetCount());
+        self::assertCount(1, $sheet1c->getDrawingCollection());
+        self::assertCount(1, $sheet1o->getDrawingCollection());
+        self::assertCount(1, $sheet2c->getDrawingCollection());
+        self::assertCount(1, $sheet2o->getDrawingCollection());
+        self::assertEquals('original', $sheet1o->getCell('A8')->getValue());
+        self::assertEquals('original', $sheet2o->getCell('A8')->getValue());
+        self::assertEquals('cloned', $sheet1c->getCell('A8')->getValue());
+        self::assertEquals('cloned', $sheet2c->getCell('A8')->getValue());
+    }
+}