Each archiving task or service runs according to a schedule that you define. The possible schedules for each task are as follows:
The default schedule, which is the one that you set in the site properties. This schedule applies to all archiving tasks in your Enterprise Vault site.
The task's own schedule, which is the one that you set by editing its properties. You edit this schedule if you want to provide specific settings for that task, overriding those in the site properties.