at the end cron from dayless have some problems
back to use the cron.tar.gz from this thread, it seems to work quite goot,
best thig is to 'port' fcron since it have already the debian dir inside, from its
readme:
----
1.1. About fcron

1.1.1. What is fcron?

Fcron is a scheduler. It aims at replacing Vixie Cron, so it implements
most of its functionalities.

But contrary to Vixie Cron, fcron does not need your system to be up 7
days a week, 24 hours a day: it also works well with systems which are
not running neither all the time nor regularly (contrary to
anacrontab).

In other words, fcron does both the job of Vixie Cron and anacron, but
does even more and better ) ...

To do so, fcron allows you to use the standard mode in which you tell
it to execute one command at a given date and hour and to make it run a
command according to its time of execution, which is normally the same
as system up time. For example:

Run the task 'save /home/ directory' every 3h15 of system up time.

and, of course, in order to make it really useful, the time remaining
until next execution is saved each time the system is stopped. You can
also say:

run that command once between 2am and 5am

which will be done if the system is running at any time in this
interval.

Fcron also includes a useful system of options, which can be applied
either to every lines following the declaration or to a single line.
Some of the supported options permit to:

* run jobs one by one (fcrontab option serial),
* set the max system load average value under which the job should be
run (fcrontab option lavg),
* set a nice value for a job (fcrontab option nice),
* run jobs at fcron's startup if they should have been run during
system down time (fcrontab option bootrun),
* mail user to tell him a job has not run and why (fcrontab option
noticenotrun),
* a better management of the mailing of outputs ...

----

and is also well mantained (2007)