原文：http://bash.cyberciti.biz/backup/rsync-backup-replication-script/
这个shell脚本需要用到ssh安全服务，因此你具备“密码登录ssh使用ssh密钥的设置”及“SSH的公开密钥基础的认证”等方面的知识。
rsync 是一个快速增量文件传输工具，它可以用于在同一主机备份内部的备分，我们还可以把它作为不同主机网络备份工具之用。本文主要讲述的是如何自架rsync服务器，以实现文件传输、备份和镜像。相对tar和wget来说，rsync 也有其自身的优点，比如速度快、安全、高效；
以下是该shell脚本的源代码：
#!/bin/bash
# Remote Server Rsync backup Replication Shell Script
# -------------------------------------------------------------------------
# Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# Local dir location
LOCALBAKPOINT=/disk3
LOCALBAKDIR=/remote/home/httpd/
# remote ssh server
# user
SSHUER=brootbeer
# server IP / host
SSHSERVER=10.10.11.12
#remote dir to backup
SSHBACKUPROOT=/disk2.backup/hot/
rsync --exclude '*access.log*' --exclude '*error.log*' -avz -e 'ssh ' ${SSHUER}@${SSHSERVER}:${SSHBACKUPROOT} ${LOCALBAKPOINT}${LOCALBAKDIR}
# log if backup failed or not to /var/log/messages file
[ $? -eq 0 ] && logger 'RSYNC BACKUP : Done' || logger 'RSYNC BACKUP : FAILED!'
# Replicate backup to /disk1 and /disk2
# You can also use format user@host:/path
# refer to rsync man page
SRC=${LOCALBAKPOINT}${LOCALBAKDIR}
DST="/disk1/remote /disk2/remote"
for d in $DST
do
[ ! -d $d ] && mkdir -p $d || :
rsync -avr $SRC $d
done |