Event media, meaning photos, videos and voice notes, is permanently deleted once your plan's storage runs out. On a paid plan that is twelve months from the day the event was created. On the free event it is four weeks.
The free event is there to show you what Kapture does, not to store anything. Four weeks is enough to come back for the album and not enough to be a backup. Run it on a paid plan if you want the year.
Download your album before then either way. The dashboard produces a ZIP you keep forever, and once the window closes the files are gone and we cannot recover them.
The demo event on our homepage is wiped daily and is not storage for anything you care about.