anacron + backup

[Martin Ericsson]

Hi,
I want to do a daily backup of my home directory onto a partition on 
another HD and save the last seven backups.

Question 1:
How do I make a script to perform that kind of backup?

Question 2:
I've noticed that both anacron and cron are installed on my hoary 
system. Since I don't have my computer running 24/7 I don't see the need 
for cron, but it's marked as suggested (or recommended, don't remember) 
by anacron.

Running ps ax | grep cron just gives me cron, so I guess that anacron 
uses cron somehow? But I can't figure out just how. anacrontab says:

1       5       cron.daily       nice run-parts --report /etc/cron.daily
7       10      cron.weekly      nice run-parts --report /etc/cron.weekly
@monthly        15      cron.monthly nice run-parts --report 
/etc/cron.monthly

and in i.e. cron.daily there's a file called 0anacron. So it seems like 
anacron calls cron which calls anacron? Could somebody explain the setup 
to me so I know where to but my scripts?

Regards,
Martin Ericsson

PS: If there's another way to perform the backup with using anacron and 
scripts, please tell me!