diff --git a/application/applicationextension.inc.php b/application/applicationextension.inc.php
index 106f029d0..915eda70d 100644
--- a/application/applicationextension.inc.php
+++ b/application/applicationextension.inc.php
@@ -2281,4 +2281,22 @@ interface iKPILoggerExtension
      * @return mixed
      */
     public function LogOperation($oKpiLogData);
-}
\ No newline at end of file
+}
+
+/**
+ * Implement this interface to add files to the backup
+ *
+ * @api
+ * @since 3.2.0
+ */
+interface iBackupExtraFilesExtension
+{
+	/**
+	 * Returns an array of files and directories to be included in the backup
+	 *
+	 * @api
+	 *
+	 * @return string[]
+	 */
+	public function GetExtraFiles(): array;
+}
diff --git a/setup/backup.class.inc.php b/setup/backup.class.inc.php
index ebb7a542d..43c0aeeb8 100644
--- a/setup/backup.class.inc.php
+++ b/setup/backup.class.inc.php
@@ -265,35 +265,45 @@ class DBBackup
 			SetupUtils::copydir($sExtraDir, $sFile);
 			$aRet[] = $sFile;
 		}
+
+		$aExtraFiles = [];
 		if (MetaModel::GetConfig() !== null) // During unattended install config file may be absent
 		{
 			$aExtraFiles = MetaModel::GetModuleSetting('itop-backup', 'extra_files', []);
-			foreach($aExtraFiles as $sExtraFileOrDir)
+		}
+
+		foreach (utils::GetClassesForInterface('iBackupExtraFilesExtension', '', ['[\\\\/]lib[\\\\/]', '[\\\\/]node_modules[\\\\/]', '[\\\\/]test[\\\\/]', '[\\\\/]tests[\\\\/]']) as $sExtensionClass)
+		{
+			/** @var iBackupExtraFilesExtension $oExtensionInstance */
+			$oExtensionInstance = new $sExtensionClass();
+			$aExtraFiles = array_merge($aExtraFiles, $oExtensionInstance->GetExtraFiles());
+		}
+
+		foreach($aExtraFiles as $sExtraFileOrDir)
+		{
+			if(!file_exists(APPROOT.'/'.$sExtraFileOrDir)) {
+				continue; // Ignore non-existing files
+			}
+
+			$sExtraFullPath = utils::RealPath(APPROOT.'/'.$sExtraFileOrDir, APPROOT);
+			if ($sExtraFullPath === false)
 			{
-				if(!file_exists(APPROOT.'/'.$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[] = $sFile;
-				}
+				throw new Exception("Backup: Aborting, resource '$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)
diff --git a/tests/php-unit-tests/unitary-tests/application/applicationextension/ApplicationExtensionTest.php b/tests/php-unit-tests/unitary-tests/application/applicationextension/ApplicationExtensionTest.php
index db3474b25..3e4f53fcd 100644
--- a/tests/php-unit-tests/unitary-tests/application/applicationextension/ApplicationExtensionTest.php
+++ b/tests/php-unit-tests/unitary-tests/application/applicationextension/ApplicationExtensionTest.php
@@ -161,6 +161,10 @@ class ApplicationExtensionTest extends ItopCustomDatamodelTestCase
 				\iNewsroomProvider::class,
 				static::ENUM_API_CALL_METHOD_GETCLASSESFORINTERFACE,
 			],
+			\iBackupExtraFilesExtension::class => [
+				\iBackupExtraFilesExtension::class,
+				static::ENUM_API_CALL_METHOD_GETCLASSESFORINTERFACE,
+			],
 		];
 	}
 }
diff --git a/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml b/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml
index 96d06ee9b..3a80b4c47 100644
--- a/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml
+++ b/tests/php-unit-tests/unitary-tests/application/applicationextension/Delta/application-extension-usages-in-snippets.xml
@@ -350,6 +350,21 @@ class ExampleFor_iKPILoggerExtension implements \iKPILoggerExtension
 	{
 	  // Do nothing, we just need the class to exists for the unit test
 	}
+}
+      ]]></content>
+    </snippet>
+    <snippet id="ExampleFor_iBackupExtraFilesExtension" _delta="define">
+      <placement>core</placement>
+      <rank>0</rank>
+      <content><![CDATA[
+class ExampleFor_iBackupExtraFilesExtension implements \iBackupExtraFilesExtension
+{
+	public function GetExtraFiles()
+	{
+		return [
+		  'foo'
+		];
+	}
 }
       ]]></content>
     </snippet>