You can create, modify, or delete a snapshot schedule on the Manage Snapshot Schedules page.
Create a new schedule
Modify an existing schedule
Delete an existing schedule
When you create a snapshot schedule, you have the option of enabling the schedule so that it starts creating snapshots at the start date and time, or you can leave the snapshot schedule disabled and keep it in reserve to enable when you need it.
If a snapshot schedule fails three times, the snapshot schedule is automatically disabled, and an event is logged in the vSphere Client Tasks & Events tab. No error is displayed, so if a snapshot is not created on schedule, you should check the event log.