linux下文件的完全+增量备份

linux系统下tar可以实现对文件的备份与恢复，以下shell是完全+增量方式备份

 

结合crontab，实现周1到周6每天两次增量备份，周日上午增量，下午为完全备份。

 

2 6,13 * * * /root/backupweb.sh

 

#!/bin/sh
# 在crontab里设置，每周日完全备份，每天两次增量备份。
# 2010-5-26 by lgq

dayofweek=`date "+%u%H"`

today=`date "+%Y%m%d%H%M"`

source=/home/web/

backup=/home/web_bak/webtar/

cd $backup

if [ $dayofweek -eq 018 ]; then
                if [ ! -f "full$today.tar.gz" ];then
                                rm -rf snapshot
                                tar -g snapshot -zcf "full$today.tar.gz" $source
                fi
else
                if [ ! -f "inc$today.tar.gz" ];then
                                tar -g snapshot -zcf "inc$today.tar.gz" $source
                fi
fi