To maintain snapshot for all schedules/shared schedules of a report

Hi,

I have a report with 3 schedules, which are all will run in different time interval.

I want to maintain report history(snapshot) for all the schedules of this report.

But in report server's snapshot options we have an option to select any one of schedule/shared schedule, for which we want to maintain snapshot.

But my requirement is I have to maintain report history(snapshot) for all schedule/shared schedules. How it can be done? Kindly help.

Thanks in advance.