diff --git a/datamodels/2.x/itop-backup/dbrestore.class.inc.php b/datamodels/2.x/itop-backup/dbrestore.class.inc.php
index 35ce559af..d285e8cf2 100644
--- a/datamodels/2.x/itop-backup/dbrestore.class.inc.php
+++ b/datamodels/2.x/itop-backup/dbrestore.class.inc.php
@@ -187,6 +187,12 @@ class DBRestore extends DBBackup
 				@chmod($sConfigFile, 0770); // Allow overwriting the file
 				rename($sDataDir.'/config-itop.php', $sConfigFile);
 				@chmod($sConfigFile, 0440); // Read-only
+				
+				$aExtraFiles = $this->ListExtraFiles($sDataDir);
+				foreach($aExtraFiles as $sSourceFilePath => $sDestinationFilePath) {
+					SetupUtils::builddir(dirname($sDestinationFilePath));
+					rename($sSourceFilePath, $sDestinationFilePath);
+				}
 
 				try {
 					SetupUtils::rrmdir($sDataDir);
@@ -211,4 +217,31 @@ class DBRestore extends DBBackup
 			$oRestoreMutex->Unlock();
 		}
 	}
+
+	/**
+	 * List the 'extra files' found in the decompressed archive
+	 * (i.e. files other than config-itop.php, delta.xml, itop-dump.sql or production-modules/*
+	 * @param string $sDataDir
+	 * @return string[]
+	 */
+	protected function ListExtraFiles(string $sDataDir)
+	{
+		$aExtraFiles = [];
+		$aStandardFiles = ['config-itop.php', 'itop-dump.sql', 'production-modules', 'delta.xml'];
+		$oDirectoryIterator = new RecursiveDirectoryIterator($sDataDir, FilesystemIterator::CURRENT_AS_FILEINFO|FilesystemIterator::SKIP_DOTS);
+		$oIterator = new RecursiveIteratorIterator($oDirectoryIterator);
+		foreach ($oIterator as $oFileInfo)
+		{
+			if (in_array($oFileInfo->getFilename(), $aStandardFiles)) {
+				continue;
+			}
+			if (strncmp($oFileInfo->getPathname(), $sDataDir.'/production-modules', strlen($sDataDir.'/production-modules')) == 0) {
+				continue;
+			}
+			
+			$aExtraFiles[$oFileInfo->getPathname()] = APPROOT.substr($oFileInfo->getPathname(), strlen($sDataDir));
+		}
+		
+		return $aExtraFiles;
+	}
 }
diff --git a/setup/backup.class.inc.php b/setup/backup.class.inc.php
index 2394f8de8..3d5817398 100644
--- a/setup/backup.class.inc.php
+++ b/setup/backup.class.inc.php
@@ -222,11 +222,12 @@ class DBBackup
 	 *
 	 * @param string $sSourceConfigFile
 	 * @param string $sTmpFolder
+	 * @param bool $bSkipSQLDumpForTesting 
 	 *
 	 * @return array list of files to archive
 	 * @throws \Exception
 	 */
-	protected function PrepareFilesToBackup($sSourceConfigFile, $sTmpFolder)
+	protected function PrepareFilesToBackup($sSourceConfigFile, $sTmpFolder, $bSkipSQLDumpForTesting = false)
 	{
 		$aRet = array();
 		if (is_dir($sTmpFolder))
@@ -243,7 +244,7 @@ class DBBackup
 		{
 			$sFile = $sTmpFolder.'/config-itop.php';
 			$this->LogInfo("backup: adding resource '$sSourceConfigFile'");
-			copy($sSourceConfigFile, $sFile);
+			@copy($sSourceConfigFile, $sFile); // During unattended install config file may be absent
 			$aRet[] = $sFile;
 		}
 
@@ -264,9 +265,43 @@ class DBBackup
 			SetupUtils::copydir($sExtraDir, $sFile);
 			$aRet[] = $sFile;
 		}
-		$sDataFile = $sTmpFolder.'/itop-dump.sql';
-		$this->DoBackup($sDataFile);
-		$aRet[] = $sDataFile;
+		if (MetaModel::GetConfig() !== null) // During unattended install config file may be absent
+		{
+			$aExtraFiles = MetaModel::GetModuleSetting('itop-backup', 'extra_files', []);
+			foreach($aExtraFiles as $sExtraFileOrDir)
+			{
+				if(!file_exists(APPROOT.'/'.$sExtraFileOrDir)) {
+					continue; // Ignore non-existing files
+				}
+	
+				$sExtraFullPath = utils::RealPath(APPROOT.'/'.$sExtraFileOrDir, APPROOT);
+				if ($sExtraFullPath === false)
+				{
+					throw new Exception("Backup: Aborting, resource '$sExtraFileOrDir'. Considered as UNSAFE because not inside the iTop directory.");
+				}
+				if (is_dir($sExtraFullPath))
+				{
+					$sFile = $sTmpFolder.'/'.$sExtraFileOrDir;
+					$this->LogInfo("backup: adding directory '$sExtraFileOrDir'");
+					SetupUtils::copydir($sExtraFullPath, $sFile);
+					$aRet[] = $sFile;
+				}
+				elseif (file_exists($sExtraFullPath))
+				{
+					$sFile = $sTmpFolder.'/'.$sExtraFileOrDir;
+					$this->LogInfo("backup: adding file '$sExtraFileOrDir'");
+					@mkdir(dirname($sFile), 0755, true);
+					copy($sExtraFullPath, $sFile);
+					$aRet[] = $sFile;
+				}
+			}
+		}
+		if (!$bSkipSQLDumpForTesting)
+		{
+			$sDataFile = $sTmpFolder.'/itop-dump.sql';
+			$this->DoBackup($sDataFile);
+			$aRet[] = $sDataFile;
+		}
 
 		return $aRet;
 	}
diff --git a/tests/php-unit-tests/unitary-tests/setup/DBBackupDataTest.php b/tests/php-unit-tests/unitary-tests/setup/DBBackupDataTest.php
new file mode 100644
index 000000000..02ec0734a
--- /dev/null
+++ b/tests/php-unit-tests/unitary-tests/setup/DBBackupDataTest.php
@@ -0,0 +1,119 @@
+<?php
+
+namespace Combodo\iTop\Test\UnitTest\Core;
+
+use Combodo\iTop\Test\UnitTest\ItopDataTestCase;
+use DBBackup;
+use DBRestore;
+use MetaModel;
+use SetupUtils;
+
+/**
+ * @runTestsInSeparateProcesses
+ * @preserveGlobalState disabled
+ * @backupGlobals disabled
+ */
+class DBBackupDataTest extends ItopDataTestCase
+{
+	/**
+	 * @dataProvider prepareFilesToBackupProvider
+	 */
+	public function testPrepareFilesToBackup(array $aExtraFiles, bool $bUnsafeFileException)
+	{
+		$sTmpDir = sys_get_temp_dir().'/testPrepareFilesToBackup-'.time();
+		$oBackup = new DBBackup(MetaModel::GetConfig());
+		MetaModel::GetConfig()->SetModuleSetting('itop-backup', 'extra_files', array_keys($aExtraFiles));
+		
+		foreach($aExtraFiles as $sExtraFile => $bExists)
+		{
+			if ($bExists)
+			{
+				@mkdir(dirname(APPROOT.'/'.$sExtraFile), 0755, true);
+				file_put_contents(APPROOT.'/'.$sExtraFile, 'Hello World!');
+			}
+		}
+		
+		if ($bUnsafeFileException)
+		{
+			$this->expectExceptionMessage("Backup: Aborting, resource '$sExtraFile'. Considered as UNSAFE because not inside the iTop directory.");
+		}
+		$aFiles = $this->InvokeNonPublicMethod('DBBackup', 'PrepareFilesToBackup', $oBackup, [APPROOT.'/conf/production/config-itop.php', $sTmpDir, true]);
+		SetupUtils::rrmdir($sTmpDir);
+		$aExpectedFiles = [
+			$sTmpDir.'/config-itop.php',
+		];
+		foreach($aExtraFiles as $sRelFile => $bExists)
+		{
+			if ($bExists)
+			{
+				$aExpectedFiles[] = $sTmpDir.'/'.$sRelFile;
+			}
+		}
+		sort($aFiles);
+		sort($aExpectedFiles);
+		$this->assertEquals($aFiles, $aExpectedFiles);
+
+		// Cleanup
+		foreach($aExtraFiles as $sExtraFile => $bExists)
+		{
+			if ($bExists)
+			{
+				unlink(APPROOT.'/'.$sExtraFile);
+			}
+		}
+	}
+	
+	function prepareFilesToBackupProvider()
+	{
+		return [
+			'no_extra_file' => ['aExtraFiles' => [], false],
+			'one_extra_file' => ['aExtraFiles' => ['foo.txt' => true], false],
+			'three_extra_file_and_dir' => ['aExtraFiles' => ['foo.txt' => true, 'gabu/zomeu.xml' => true, 'meuh.html' => true], false],
+			'two_extra_file_but_only_one_exists' => ['aExtraFiles' => ['foo.txt' => true, 'meuh.html' => false], false],
+			'one_unsafe_file' => ['aExtraFiles' => ['../foo.txt' => true], true],
+		];
+	}
+
+	/**
+	 * @dataProvider restoreListExtraFilesProvider
+	 */
+	function testRestoreListExtraFiles($aFilesToCreate, $aExpectedRelativeExtraFiles)
+	{
+		require_once(APPROOT.'/env-production/itop-backup/dbrestore.class.inc.php');
+
+		$sTmpDir = sys_get_temp_dir().'/testRestoreListExtraFiles-'.time();
+		
+		foreach($aFilesToCreate as $sRelativeName)
+		{
+			$sDir = $sTmpDir.'/'.dirname($sRelativeName);
+			if(!is_dir($sDir))
+			{
+				mkdir($sDir, 0755, true);
+			}
+			file_put_contents($sTmpDir.'/'.$sRelativeName, 'Hello world.');
+		}
+		$aExpectedExtraFiles = [];
+		foreach($aExpectedRelativeExtraFiles as $sRelativeName)
+		{
+			$aExpectedExtraFiles[$sTmpDir.'/'.$sRelativeName] = APPROOT.'/'.$sRelativeName;
+		}
+		
+		$oRestore = new DBRestore(MetaModel::GetConfig());
+		$aExtraFiles = $this->InvokeNonPublicMethod('DBRestore', 'ListExtraFiles', $oRestore, [$sTmpDir]);
+		
+		asort($aExtraFiles);
+		asort($aExpectedExtraFiles);
+		$this->assertEquals($aExpectedExtraFiles, $aExtraFiles);
+		SetupUtils::rrmdir($sTmpDir);
+	}
+
+	function restoreListExtraFilesProvider()
+	{
+		return [
+			'no extra file' => ['aFilesToCreate' => ['config-itop.php', 'itop-dump.sql', 'delta.xml'], 'aExpectedExtraFiles' => []],
+			'no extra file (2)' => ['aFilesToCreate' => ['config-itop.php', 'itop-dump.sql', 'delta.xml', 'production-modules/test/module.test.php'], 'aExpectedExtraFiles' => []],
+			'one extra file' => ['aFilesToCreate' => ['config-itop.php', 'itop-dump.sql', 'delta.xml', 'production-modules/test/module.test.php', 'collectors/ldap/conf/params.local.xml'], 'aExpectedExtraFiles' => ['collectors/ldap/conf/params.local.xml']],
+		];
+	}
+	
+}