Auto mount external drive

Hi,

I want to write a shell script which would auto mount usb external drive.

The idea is to do rotational backup for data using usb external drive. so when external drive is connected to usb it get's automatically labeled as backup & drive gets mounted as /backup.

Can any one let me know if this can achieved using shell script ?

Thanks
Dhaval Joshi

linux.byexamples.com/archives/321/fstab-with-uuid/
reactivated.net/writing_udev_rules.html -- "Running external programs upon certain events"
wiki.archlinux.org/index.php/Execute_on_USB_insert