In order to schedule a report version to be created at an interval of your choosing, navigate to your report and to the Report Settings tab, expand the Schedule section in the page, and click the Schedule button. In the revealed popup window, indicate whether you'd like your report versions to be created daily or weekly. Then choose one of the three options regarding when you'd like the scheduling to end. You can choose the schedule to end on a certain date, after so many occurrences, or never. Click Apply to save your schedule when you're done.
You will be able to find these versions as they are created in the Versions tab.