We always gather fresh data from your website when a new analysis is run (Page Analysis or Crawl). There is no cache in analyses.
Once the report is generated, it is saved in your account and reachable from Page Analysis or Crawl tools.
You can run a new analysis to refresh your report to see modifications just by clicking on "Update" (At the top right of the report). This button allows you to run an analysis for the same URL (the same number of credits will be charged).
Page screenshots (screenshot at the top left of the Page Analysis) are cached for 14 days. They don't represent the page analyzed, they are just illustrations.