linux下tar做文件系统增量备份
想给项目的CVS做个自动备份的脚本，一看目录大小，已经有近20个G。天天做完整备份太费资源了，增量备份是一个解决方案了。计划每周末做一次完整备份，然后每天做增量备份。
Linux做增量备份还是很容易的，tar命令就可以。
在cron里设置,每周日晚执行(每周日全备份,其余时间增量备份)。下面是从网上找了两个示例的脚本。
示例一:(http://www.cnblogs.com/coffee_cn/archive/2010/03/26/1697038.html)
#!/bin/bash# define
dayofweek=`date "+%u"`
today=`date "+%Y%m%d"`
source=/data/
backup=/backup/
# action
cd $backup
if [ $dayofweek -eq 1 ]; then
if [ ! -f "full$today.tar.gz" ]; then
rm -rf snapshot
tar -g snapshot -zcf "full$today.tar.gz" $source --exclude $sourceserver.log
fi
else
if [ ! -f "inc$today.tar.gz" ]; then
tar -g snapshot -zcf "inc$today.tar.gz" $source --exclude $sourceserver.log
fi
fi
示例二:(http://www.futuremedia.pl/pub/projekty/backup/backup)#!/bin/bash# simple backup script. intended to run daily from crontab
# called "biedacula" after "bieda", which is Polish word for "poor".
# implements poor man's GFS scheme, hence the name:)
# requires GNU tar, GNU gzip and ncftp
# these files must contain file/dir paths (one a line)
PATHFILE=/etc/backup-defs
SKIPFILE=/etc/backup-excludes
# this is a snapshot file auto-created by GNU tar
SNAPSHOT=/etc/backup-snapshot
# FTP host to send backups ( must allow anonymous RW access for me )
FTPHOST=192.168.2.2
FTPPORT=21
# when to do full, monthly/weekly backups
FULL_MONTHDAY=1 # 1st day of month
FULL_WEEKDAY=7 # Sunday
# how many "tapes" for monthly backups
KEEP_MONTHLY=3
# how many "tapes" for weekly backups
KEEP_WEEKLY=4
# in total you will have ( KEEP_MONTHLY + KEEP_WEEKLY + 6 ) "tapes"
function biedump {
local TYPE=$1
local LABEL=$2
local start=`date +%Y%m%d%H%M`
echo "$start: Starting $TYPE dump to label $LABEL"
if [ "x$TYPE" == "xfull" ] ; then
rm -rf $SNAPSHOT
fi
tar -c -T$PATHFILE -X$SKIPFILE -g$SNAPSHOT -P -f -
| gzip
| ncftpput -c -S.tmp -P $FTPPORT $FTPHOST $LABEL
local res=$?
local end=`date +%Y%m%d%H%M`
if [ $res -eq 0 ]; then
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