When should you set up custom analytics views in your sources or pages reports?

You should set this up as soon as ‌you think you may need one. A custom analytics view will only start tracking data the day it’s created and won’t include historical data.
You should set this up in the middle of your regional campaigns. HubSpot needs a start and end date to accurately capture and compile information into the view.
You should set this up at the end of your campaign, because data is pulled from your sources and pages report. The view will populate any historical data you need.
Due to the filters available in the sources and pages report after a recent update, the custom analytics views feature has been sunset. You no longer need to set them up to track the information you need.

The correct answer is:

You should set this up as soon as ‌you think you may need one. A custom analytics view will only start tracking data the day it’s created and won’t include historical data.