A Subversion full or differential backup script.

svn-backup.sh

#!/bin/bash

if [ $# != 3 ]; then
	echo "This script backup all of SVN repositories under the [svn root] directory, to the [backup root] directory."
	echo "usage: svn-backup ['full'|'part'] [svn root] [backup root]"
	echo "example: svn-backup full /opt/svn-repos /opt/svn-backup"
	exit
fi

mode=$1
svn_root=$2
backup_root=$3

for project in `ls -F $svn_root | grep /$ | sed 's/\///g'`
do
	project_dir="$svn_root/$project"
	backup_dir="$backup_root/$project"
	pri_backup_dir="$backup_root/$project.old"
	backup_info="$project_dir/backup_info"
	last_version=`svnlook youngest $project_dir`

	if [ ! -f $backup_info ]; then
		echo 0 > $backup_info
	fi

	last_backup_version=`cat $backup_info`

	if [ $mode != 'full' ] && [ $last_backup_version == $last_version ]; then
		echo "`date +"%F %R:%S"`  '$project' nothing to do"
	else
		if [ $mode == 'full' ] || [ $last_backup_version == '0' ] || [ ! -d $backup_dir ]; then
			echo "`date +"%F %R:%S"`  '$project' full backup"
			if [ -d $pri_backup_dir ]; then
				rm -rf $pri_backup_dir
			fi
			if [ -d $backup_dir ]; then
				mv $backup_dir "$pri_backup_dir"
			fi
			svnadmin hotcopy $project_dir $backup_dir
			last_version=`svnlook youngest $backup_dir`
		else
			last_backup_version=$((last_backup_version + 1))
			echo "`date +"%F %R:%S"`  '$project' version $last_backup_version to $last_version"
			backup_file="$backup_dir/v$last_backup_version-$last_version.bk"
			svnadmin dump --incremental -q -r $last_backup_version:$last_version $project_dir > $backup_file
		fi

		echo $last_version > $backup_info
	fi
done

echo "`date +"%F %R:%S"`  done"
echo ""

Use this script with crontab. Full backup at 5 AM. Differential backup every one hour in 09:00 ~ 23:00.

0 5 * * * /opt/svn-repos/svn-backup full /opt/svn-repos /home/lms/svn-backup >> /opt/svn-repos/svn-backup.log
0 9-23/1 * * * /opt/svn-repos/svn-backup part /opt/svn-repos /home/lms/svn-backup >> /opt/svn-repos/svn-backup.log