rsync backup over ssh

rsync-backup.sh

#!/bin/sh

# This script does backups to a remote server over ssh. the account running this script 
# must have ssh access to the remote server using passwordless key authentication.
# perform:
# > ssh-keygen -q
# > ssh-copy-id [username]@[hostname]
# test with: `ssh [username]@[hostname]` & add script to cron
# > crontab -e
# #backup: every day @ 03:30 & log output.
# 30 3 * * * /root/backup.sh >> /tmp/system_backup.log 2>&1

# directories to backup (seperated by spaces)
BSRC="/etc/mysql/ /usr/local/mysql/data/BACKUP/"

# backup machine settings (data is stored under the BUSER's home dir in $BRFOLDER)
BSERVER=servername.domain
BUSER=backup_user
BRFOLDER=`hostname`

########################################################################

BACKUP_NAME=`date +%2u-%A`
BDEST=$BUSER@$BSERVER:$BRFOLDER/000-current
OPTS="-avzR --delete --backup --backup-dir=$BRFOLDER/$BACKUP_NAME"

export PATH=$PATH:/bin:/usr/bin:/usr/local/bin

# create backup root dir on remote server if it doesn't exist yet.
ssh $BUSER@$BSERVER "[ -d $BRFOLDER ] || mkdir -p $BRFOLDER"

# the following line clears the last weeks incremental directory
echo "Cleaning up backup: $BACKUP_NAME"
[ -d $HOME/emptydir ] || mkdir $HOME/emptydir
rsync --delete -a $HOME/emptydir/ $BUSER@$BSERVER:$BRFOLDER/$BACKUP_NAME
rmdir $HOME/emptydir

echo "Performing Backup: rsync $OPTS $BSRC $BDEST"
# now the actual transfer
rsync $OPTS $BSRC $BDEST