Classe para fazer backup de diretórios.

config.properties

# Linux
infolder /home/h3nrique/Documents/test_folder_backup
# Windows
# infolder C:\\Folder\\To\Backup

# Linux
outfolder /home/h3nrique/Desktop
# Windows
# outfolder C:\\Folder\\To\Put\\Zip\\File

outfile backupTestFolder.zip
datelimitfile 30

ZipApplication.java

package com.package.utils;

/*
 * This code is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.Serializable;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * Classe para fazer backup de diretórios.
 * 
 * @version -1 (TODO : Organizar o código.)
 * 
 * @author <a href="mailto:paulohenriqueas13@gmail.com">Paulo H3nrique Alves</a>
 */
public class ZipApplication {

	private static Properties properties = new Properties();
	private static String DESTINATION_FOLDER;
	private static String SOURCE_FOLDER;
	private static Integer LIMIT_DATE;
	private static SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd_HH'h'mm'min'");

	public static void main(String[] args) {
		
		String zipFileName = null;
		byte[] buffer = new byte[1024];
		File file3 = null;
		File file4 = null;
		
		// START - Carrega arquivo properties
		try {
			properties.load(new BufferedReader(new FileReader("config.properties")));
		} catch (FileNotFoundException e) {
			System.err.println("Arquivo de propriedades não encontrado");
			System.exit(1);
		} catch (IOException e) {
			System.err.println("Erro ao ler arquivo de propriedades.");
			System.exit(1);
		}
		try {
			DESTINATION_FOLDER = properties.get("outfolder").toString();
			SOURCE_FOLDER = properties.get("infolder").toString();
			zipFileName = properties.get("outfile").toString();
			LIMIT_DATE = Integer.valueOf(properties.get("datelimitfile").toString());
			if(!new File(DESTINATION_FOLDER).isDirectory() || !new File(SOURCE_FOLDER).isDirectory()) {
				new Exception("Diretório inválido");
			}
			file3 = new File(DESTINATION_FOLDER);
			file4 = new File(SOURCE_FOLDER);
		} catch (Exception e) {
			System.err.println("Arquivo de propriedades inválido.");
			System.exit(1);
		}
		// START - Carrega arquivo properties
		
		// START - Remove os arquivos que expirou o prazo de backup
		if (file3.isDirectory()) {
			String[] files = file3.list();
			for (String file : files) {
				try {
					File file2 = new File(file3.getAbsolutePath() + File.separator + file);
					Long fileDateInMillis = file2.lastModified();
					Calendar dataRemocao = Calendar.getInstance();
					dataRemocao.add(Calendar.DAY_OF_MONTH, -LIMIT_DATE);
					Long dataRemocaoInMillis = dataRemocao.getTimeInMillis();
					
					if (file2.isFile() && file2.getName().replace(".zip", "").contains(zipFileName) && fileDateInMillis.compareTo(dataRemocaoInMillis) < 0 && file2.canWrite()) {
						System.out.println("Excluindo arquivo :: " + file2);
						file2.delete();
					}
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
		// END - Remove os arquivos que expirou o prazo de backup
		
		// START - Cria lista de arquivos a serem zipados
		List<String> listaDeArquivos = criarListaDeArquivos(file4);
		// END - Cria lista de arquivos a serem zipados

		// START - Zipa os arquivos
		try {
			zipFileName = zipFileName.replace(".zip", "");
			String dateAsString = simpleDateFormat.format(new Date());
			zipFileName = zipFileName + "_" + dateAsString + ".zip";
			File file2 = new File(DESTINATION_FOLDER);
			FileOutputStream fos = new FileOutputStream(file2.getAbsolutePath() + File.separator + zipFileName);
			
			ZipOutputStream zos = new ZipOutputStream(fos);

			System.out.println("Criando zip :: " + file2.getAbsolutePath() + File.separator + zipFileName);

			for (String file : listaDeArquivos) {

				System.out.println("Adicionando arquivo :: " + file);
				ZipEntry ze = new ZipEntry(file);
				zos.putNextEntry(ze);

				FileInputStream in = new FileInputStream(SOURCE_FOLDER + File.separator + file);

				int len;
				while ((len = in.read(buffer)) > 0) {
					zos.write(buffer, 0, len);
				}

				in.close();
			}

			zos.closeEntry();
			zos.close();
		} catch (IOException ex) {
			ex.printStackTrace();
		}
		// START - Zipa os arquivos
		
		System.out.println("Concluido");
		System.exit(0);
	}

	public static List<String> criarListaDeArquivos(File file) {
		List<String> fileListReturn = new ArrayList<String>();
		
		if (file.isFile()) {
			String absoluteFile = file.getAbsoluteFile().toString();
			fileListReturn.add(absoluteFile.substring(SOURCE_FOLDER.length() + 1, absoluteFile.length()));
		}

		if (file.isDirectory()) {
			String[] fileListB = file.list();
			for (String file2 : fileListB) {
				fileListReturn.addAll(criarListaDeArquivos(new File(file, file2)));
			}
		}
		
		return fileListReturn;

	}
}