automate backup and dvd burn

gistfile1.sh

#!/bin/sh
folder=/media/storage/Backup/
file=$folder/backup_$(date +"%Y_%m_%d_%H-%M")

echo 'Change directory and remove files older than 7days'
cd $folder
find *.tgz -mtime +7 |xargs rm

echo 'Backup process...'
if [ -d $folder ]; then
  cd /home/mikhailovanatoly/
  tar czf $file.tgz  .Skype .mozilla .mozilla-thunderbird .opera .purple .ssh Documents Projects scripts .bashrc .gitconfig .vimrc > /dev/null
fi

echo 'Erase and burn dvd-rw, then eject'
dvd+rw-format /dev/scd0
growisofs -Z /dev/scd0 -R -J $file.tgz
eject

# In case of Ubuntu 9.04/9.10
# make sure you have installed libnotify-bin
notify-send 'Backup is done! Take care about the dvd disc'