rsync shell 拉取模式，其实除非你要用inotify做实时备份，否则定时备份根本就用不着用rsync daemon，直接通过shell拉取就好。当然要配好无密码的公约密码登录，让备份服务器可以访问到待备份的数据。

rsync.php

#!/usr/sbin/php
<?php
/*
 * Rsync备份脚本
 */
set_time_limit(0);
date_default_timezone_set('Asia/Shanghai');

define('CONF_SRC', 'backup_src');
define('CONF_DST', 'backup_dest');
define('CONF_CLEAR', 'backup_clear');
define('CONF_DSTNAME', 'backup_dest_dirname');
define('TODAY_STR', date('Y-m-d', strtotime('now')));
define('YESTERDAY_STR', date('Y-m-d', strtotime('-1 day')));
define('COPY_CMD', 'cp -R -u ');
define('RSYNC_CMD', 'rsync -ahuzP --delete ');
define('RSYNC_OUTPUT_FILTER', " | sed '0,/^$/d'"); //过滤输出中间的文件列表
define('MKDIR_CMD', 'mkdir -p ');
define('RM_CMD', 'rm -rf ');

//备份任务配置信息数组
$config = array(
	/*
	'任务名' => array (
		CONF_SRC => '要备份的文件或目录的源地址，是目录的话要在末尾加斜杠',
		CONF_DST => '存放备份的本地目录的地址',
		CONF_CLEAR => '(可选)清除一定时间前的备份',
		CONF_DSTNAME => '(可选)备份的文件或目录的名字，不选用则默认使用CONF_SRC里的文件名'
	),
	*/
);

//下面开始是备份步骤
foreach ($config as $backup_item => $backup_conf) {
	$local_filename = empty($backup_conf[CONF_DSTNAME]) ? basename($backup_conf[CONF_SRC]) : $backup_conf[CONF_DSTNAME];
        $path_yesterday = $backup_conf[CONF_DST] . $local_filename . '/' . YESTERDAY_STR;
        $path_today = $backup_conf[CONF_DST] . $local_filename . '/' . TODAY_STR;
        $path_old = $backup_conf[CONF_DST] . $local_filename . '/' . date('Y-m-d', strtotime($backup_conf[CONF_CLEAR]));


	echo "=============================================================================\n";
	echo "	Backup job [{$backup_item}] start!\n";
	echo "		Source: {$backup_conf[CONF_SRC]}\n";
	echo "		Destination: {$path_today}\n";
	echo "=============================================================================\n\n";

	system(MKDIR_CMD . $path_today);
	if (file_exists($path_yesterday)) {
		echo "Found yesterday's backup, copying for base...\n";
		system(COPY_CMD . $path_yesterday . '/.' . ' ' . $path_today); //复制目录内的内容，而不要最顶级的目录
		echo "Copy complete!\n";
	}
	echo "Now start to rsync files..\n";
	system(RSYNC_CMD . $backup_conf[CONF_SRC] . ' ' . $path_today . ' ' . RSYNC_OUTPUT_FILTER);
	echo "Rsync complete\n";

	if (!empty($backup_conf[CONF_CLEAR]) && file_exists($path_old)) {
		echo "Clearing old backups\n";
		system(RM_CMD . $path_old);
		echo "Clearing complete\n";
	}
	echo "Backup job [{$backup_item}] done!\n\n";
}