code: private void saveContainers() {
          String workingDir = getMain().getFileSystemManager().getSystemDataLocation().getAbsolutePath();
          final String containerFile = workingDir + File.separator + "containers.ser";
          try {
              FileOutputStream fileOut = new FileOutputStream(containerFile);
              ObjectOutputStream out = new ObjectOutputStream(fileOut);
              out.writeObject(containers);
              out.close();
              fileOut.close();
          } catch(IOException e) {
              logger.error("Unable to save containers to file", e);
          }
      }
docs: Saves the containers to ./system/data/containers.ser