diff --git a/plugins/backup-sync-dropbox/backup-sync-dropbox.zip b/plugins/backup-sync-dropbox/backup-sync-dropbox.zip
index 0d821c01..afa20fbb 100644
Binary files a/plugins/backup-sync-dropbox/backup-sync-dropbox.zip and b/plugins/backup-sync-dropbox/backup-sync-dropbox.zip differ
diff --git a/plugins/backup-sync-dropbox/src/src/Facade/BackupFacade.php b/plugins/backup-sync-dropbox/src/src/Facade/BackupFacade.php
index 516d827f..47edccc5 100644
--- a/plugins/backup-sync-dropbox/src/src/Facade/BackupFacade.php
+++ b/plugins/backup-sync-dropbox/src/src/Facade/BackupFacade.php
@@ -26,10 +26,12 @@ public function upload(UnmsBackup $unmsBackup): void
             return;
         }
 
-        $temp = tmpfile();
-        fwrite($temp, $this->unmsApi->get(sprintf('nms/backups/%s', $unmsBackup->id)));
-
-        $this->filesystem->writeStream($unmsBackup->filename, $temp);
+        $temporaryFile = $this->getTemporaryFile();
+        $resource = fopen($temporaryFile, 'wb+');
+        fwrite($resource, $this->unmsApi->get(sprintf('nms/backups/%s', $unmsBackup->id)));
+        rewind($resource);
+        $this->filesystem->writeStream($unmsBackup->filename, $resource);
+        unlink($temporaryFile);
 
         $this->logger->info(sprintf('Uploaded file "%s".', $unmsBackup->filename));
     }
@@ -51,4 +53,14 @@ public function deleteExcept(array $filenames): void
             $this->logger->info(sprintf('Deleted file "%s".', $item['path']));
         }
     }
+
+    private function getTemporaryFile(): string
+    {
+        $tempDir = realpath(sys_get_temp_dir());
+        assert(is_string($tempDir));
+        $tmpFile = tempnam($tempDir, 'ucrmTmpFile');
+        assert(is_string($tmpFile));
+
+        return $tmpFile;
+    }
 }