If you have set a work item to repeat on a recurring schedule, future work items will be created automatically containing some information from the previous work item in the schedule.
Data that is carried across includes:
File uploaded to the task descriptions
Work item description
However, there is an exception to these rules. If you are using Tasklist Automators to control task assignments and/or task due dates, then those Tasks will not be copied from previous work item. Instead, they will be created blank, and updated when the Automator is triggered.