back up to a CD ROM or DVD ROM

yes, it's doable with a cronjob. Install mkisofs and cdrecord, then create a script somewhere and paste the following in. change it to +755 permissions and execute the cron job as root daily or at whatever frequency you wanna do it.

edit crontab with the 'crontab -e' command. Oh yeah.. don't forget to change the CD every day.

Cheers.

#!/bin/sh
mkisofs -V LABEL -r <whatever you wanna backup directory> | gzip > cdrom.iso.gz
gzip -dc cdrom.iso.gz | cdrecord -v dev=/dev/cdrom -