Backup.java

    private void zipDir(String dir2zip, ZipOutputStream zos){
        try{
          File zipDir = new File(dir2zip);
          String[] dirList = zipDir.list();

          byte[] readBuffer = new byte[2156];
          int bytesIn = 0;

          for (String file : dirList) {

              File f = new File(zipDir, file);
              if (f.isDirectory()) {
                  String filePath = f.getPath();
                  zipDir(filePath, zos);
              }else{

                FileInputStream fis = new FileInputStream(f);
                ZipEntry anEntry = new ZipEntry(f.getPath());
                zos.putNextEntry(anEntry);
                while ((bytesIn = fis.read(readBuffer)) != -1) {
                    zos.write(readBuffer, 0, bytesIn);
                }
                fis.close();
              }
          }

          zos.close();

        }catch(Exception e){

        }}