Backup Script Critique

cd ~/backups/
find ~/backups/* -mtime +5 -exec rm {} \;
timestamp=`date +%m-%d-%y`
sed -i 's/#RemoveMe//' /var/www/wiki/LocalSettings.php
mysqldump -h localhost -u root -phs33tQLca wiki --default-character-set=utf8 > mw-MySQL-$timestamp-Backup.sql
sed -i 's/$wgReadOnly/#RemoveMe $wgReadOnly/' /var/www/wiki/LocalSettings.php
tar zcvhf mw-www-$timestamp-Backup.tgz /var/www/wiki