How far back?
In anticipation of this feature, we have been storing the first and last refresh of every month for the last 2+ years for you. We don't have anything prior to that.
To see further back than one month, go to the menu in the app and tap on History.
On that page, you will see two tabs: Months & Refreshes
This contains your first and last refresh that contained info about that month.
This contains the last 25 schedule refreshes. This is useful in case you want to step back and see what changed.
If you have any other questions, or if your history isn't displaying correctly, please send us an email to firstname.lastname@example.org