diff --git a/CHANGELOG.md b/CHANGELOG.md
index e17759f9d9d..2a4e79928aa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Fixed a bug where admin table header cells weren’t indicating when they were sorted. ([#15897](https://github.com/craftcms/cms/issues/15897))
+- Fixed an error that occurred when creating a database backup, if the System Name contained any quote-like characters. ([#15933](https://github.com/craftcms/cms/issues/15933))
 
 ## 4.12.7 - 2024-10-15
 
diff --git a/src/db/Connection.php b/src/db/Connection.php
index e545db00f71..0268946103f 100644
--- a/src/db/Connection.php
+++ b/src/db/Connection.php
@@ -203,9 +203,10 @@ public function close(): void
     public function getBackupFilePath(): string
     {
         // Determine the backup file path
-        $systemName = mb_strtolower(FileHelper::sanitizeFilename(Craft::$app->getSystemName(), [
+        $systemName = FileHelper::sanitizeFilename(Craft::$app->getSystemName(), [
             'asciiOnly' => true,
-        ]));
+        ]);
+        $systemName = str_replace(['\'', '"'], '', strtolower($systemName));
         $version = Craft::$app->getInfo()->version ?? Craft::$app->getVersion();
         $filename = ($systemName ? "$systemName--" : '') . gmdate('Y-m-d-His') . "--v$version";
         $backupPath = Craft::$app->getPath()->getDbBackupPath();