Thanks Lisa, we are currently running a helpdesk database on the servers and a backup is very important for us.
This may be a tip for others;
We are running 8 backup scripts, one for each day of the week, and also one script that runs every two hours.
So, if we realize on a monday morning that something has gone wrong on Saturday, we can always go back to the backup made on saturday morning, and not the 'empty backup' made on the Sunday or Monday morning.
Also, if we realize straight away that something has gone wrong, we can always use the bi-hourly backup, with a maximum loss of two hours of data.