A Snapshot represents a series of tests run at a point in time for the pages and test profiles of your site.
Calibre will automatically create snapshots (a series of tests) at allocated intervals. When you create a new site on calibreapp.com, it will default to being tested every 6 hours.
You can change the scheduler to your needs via the Site → Settings → Agent Settings page.
The options are:
There might be times when you want to create a snapshot manually or automatically as part of your continuous integration system.
To manually create a snapshot for your site, visit the snapshots page, then press the "Take a new snapshot" button.