Save data on periodic base - printer monitor

Hi all,
I’m using the dude from a while and I wonder if I can use dude to register the number of copies of my company’s printers every month.
I’m already able to retrieve the number of B/N and color copies throw SNMP, but I want to save these numbers every first day of month for statistic purpose.
At the moment I’m not able to say how much copies the printers have done on the past months.
Ideas?
Many thanks

Could you graph the daily or monthly total? You might be able to use the rate command to get the difference from the last time you grabbed the number of prints. Or if there is a way to reset the count, graph the value then reset the counter.

thanks lebowski,
but I don’t understand.
I have made the graph and the data source, but how (where) can I use the rate command?

many thanks
F