Just wanted to know if it is at all possible to export the summary numbers in each card on a page to excel (for a report). What about for a single card? Also, can it be done on a schedule?
You cannot, unfortunately.
You can schedule card(s) to be sent via email, but it's the visual including the summary number. It's not an excel file. You can also export a chart's datagrid to flat file or excel, but it doesn't include the summary number and that file export can't be scheduled.