Question 12:

Write a text file crontab-setup.txt in which you explain how you can
set up the cron program to execute the program you wrote as your
answer to question 10 every morning at 3.24 am. It should be executed
with a command line shown in the previous question.

Nick's answer:

1. type:
   crontab -e

2. In the editor that starts up, enter a line like this:
24 3 * * * rsync-to-websites ictlab:/var/www/html/mystuff 172.19.64.50:/var/www/backup 172.19.64.51:/var/www/html

3. Save the file and exit.

Note that on the remote machines, the directory must be writable by
your account on that machine.