[CentOS] Bash script for backup

Mon Jan 25 18:48:19 UTC 2010
Alan Hoffmeister <alangtk at gmail.com>

Hello guyz!

I'm new here, and this is my very first truble...

I need a script that will backup & compress the folder /media/system in 
the folder /media/backups

But that's not the problem, I need that only the last 7 backups (last 7 
days, yeah I know, cronjob...) will stay in that folder...

The script need:
1 - Compress folder /media/system
2 - Store in /media/backups
3 - Name the compressed backup like day_month_year.tar.gzip
4 - Check the other backups and delete backups older than 7 days..

Can some one help me?

Tanks!