Not to hijack, but I figured I would share my GUIless experience in setting this up.
(1) Log in, then make a directory for the backup; I put it in ~/fahbu
(2) Make the backup script; I did this by typing "sudo nano ~/fah/fahbu.sh", and then typing in the information given in Lutr0's guide. After pressing ctrl-x, then y, this is what I have:
(3) Make a new file to turn into crontab; I did this by typing "sudo nano ~/cron.sh", and then typing in the information given in Lutr0's guide. Please note, that you MUST have an empty line beneath it. (As you will soon see, it is two lines, not one.) After pressing ctrl-x, then y, this is what I have:
(4) Tell Fedora to load the new file as your crontab; I did this by typing "sudo crontab ~/cron.sh"
Verify that it took; do this by typing "sudo crontab -l"
Then you can remove the helper file by typing "sudo rm ~/cron.sh"
I then changed directory to the backup directory, and did a directory list ("ls")... and found it to be empty.
Running again at 15 mins past the hour yielded one backup.
Half past yielded two.
(I am not going to post one for Slackware XFCE, because it is substantially similar... no commands change at all.)
The disadvantage to doing it all in native console... no copy/paste options. If you did it via a console window in linux, you could use ctrl-c to copy it to your clipboard, then ctrl-shft-v it into leafpad.