http://www.110mb.com/forum/timestamp-in-cronjob-backup-t33775.0.htmlI'm guessing you use generic cPanel shared hosting...:
Summary:
Cron:
tar -cjf /home/yourUsername/backup.tar.bz2 /home/yourUsername/public_html
I suppose you'd want to label the day its from, so, to the end of that command,
php /home/yourUsername/renameBackup.php
renameBackup.php would be....
<?php
$newname="/home/yourUsername/backup-" . date("U") . ".zip.bz2";
rename("/home/yourUsername/backup.tar.bz2", $newname);
?>
So, the cron altogether...
tar -cjf /home/yourUsername/backup.tar.bz2 /home/yourUsername/public_html; php /home/yourUsername/renameBackup.php
** I HAVEN'T TESTED THIS ** But I will right now... Tested!