rsync is an open source utility that provides fast incremental file transfer. rsync is freely available under the GNU General Public License and is currently being maintained by Wayne Davison.
Here is a script of do incremental backup by rsync. Hope it can help you.
Test OS:Centos4,5 RedHatAS4,5
#!/bin/sh
#########################################################
# Script to do incremental rsync backups
# Adapted from script found on the rsync.samba.org
# Jason 3/24/2002
# This script is freely distributed under the GPL
#########################################################
##################################
# Configure These Options
##################################
###################################
# mail address for status updates
# – This is used to email you a status report
###################################
MAILADDR=your_mail_address_here
###################################
# HOSTNAME
# – This is also used for reporting
###################################
HOSTNAME=your_hostname_here
###################################
# directory to backup
# – This is the path to the directory you want to archive
###################################
BACKUPDIR=directory_you_want_to_backup
###################################
# excludes file – contains one wildcard pattern per line of files to exclude
# – This is a rsync exclude file. See the rsync man page and/or the
# example_exclude_file
###################################
EXCLUDES=example_exclude_file
###################################
# root directory to for backup stuff
###################################
ARCHIVEROOT=directory_to_backup_to
#########################################
# From here on out, you probably don’t #
# want to change anything unless you #
# know what you’re doing. #
#########################################
# directory which holds our current datastore
CURRENT=main
# directory which we save incremental changes to
INCREMENTDIR=`date +%Y-%m-%d`
# options to pass to rsync
OPTIONS="–force –ignore-errors –delete –delete-excluded \
–exclude-from=$EXCLUDES –backup –backup-dir=$ARCHIVEROOT/$INCREMENTDIR -av"
export PATH=$PATH:/bin:/usr/bin:/usr/local/bin
# make sure our backup tree exists
install -d $ARCHIVEROOT/$CURRENT
# our actual rsyncing function
do_rsync()
{
rsync $OPTIONS $BACKUPDIR $ARCHIVEROOT/$CURRENT
}
# our post rsync accounting function
do_accounting()
{
echo "Backup Accounting for Day $INCREMENTDIR on $HOSTNAME:">/tmp/rsync_script_tmpfile
echo >> /tmp/rsync_script_tmpfile
echo "################################################">>/tmp/rsync_script_tmpfile
du -s $ARCHIVEROOT/* >> /tmp/rsync_script_tmpfile
echo "Mail $MAILADDR -s $HOSTNAME Backup Report < /tmp/rsync_script_tmpfile"
Mail $MAILADDR -s $HOSTNAME Backup Report < /tmp/rsync_script_tmpfile
echo "rm /tmp/rsync_script_tmpfile"
rm /tmp/rsync_script_tmpfile
}
# some error handling and/or run our backup and accounting
if [ -f $EXCLUDES ]; then
if [ -d $BACKUPDIR ]; then
# now the actual transfer
do_rsync && do_accounting
else
echo "cant find $BACKUPDIR"; exit
fi
else
echo "cant find $EXCLUDES"; exit
fi
