If you want to regenerate data for previous points in time, you can use the backgen page.
This URL takes three parameters…
The 'name' parameter is the folder name of the capture - it will appear in the URL when browsing.
The number of 24-hour periods that the generation should follow. Defaults to 7 (one week).
The number of days between now and when you'd like to finish generating.
For example, you might generate the last month of data with the URL below…
http://myardiserver/s/sitename/capture/backgen?name=kpis&days=30
…and if that is successful, you can go further back to the previous 30 days with…
http://myardiserver/s/sitename/capture/backgen?name=kpis&days=30&offset=30