Got a question from a customer:
I am setting up a cron using a third party service. Do I have to set cron to execute the tasks both frequently, hourly and daily (or is it sufficient once a week?)

Our Answer:

If you set up frequently, hourly and daily it will make activeCollab happy! (The new Incoming Mail module uses frequently job to pull emails).

For Reports, once a week is sufficient, but you will need to ensure it gets called on the day your week starts (as per aC configuration you have). Webcron.org may be in some other timezone than your server. So you will need to ensure it gets fired at correct time. When cron gets executed, it checks if this is the start of the week, if so, it will take reporting snapshots.

Every week, on start of week (e.g. Monday) we take snapshot of previous week.