How long are Zoom Meeting Reports, such as attendees lists and polling results, accessible?
Meeting reports, such as attendee lists and polling results, can be retrieved for the last 12 months, with a search range of up to one month at a time. If a meeting is not started in 30 days, expires, and is batch deleted by Zoom, the registration reports for the meeting are also deleted. When webinars are deleted, all associated reports remain.
For more information, see: https://support.zoom.us/hc/en-us/articles/201363213-Getting-started-with-Zoom-reporting