How can a user redo a task if it has already been done?

Hello,
is it possible to redo a task if it has already been done/completed?
The use case is as follows: A user completes Task1 and Task2 and then realizes that he has made an error in Task1 and wants to redo it. Ideally, Task2 is also repeated or the user can check it, as it may have used data from Task1 and these may change as a result of the repetition of task1.

I could only find answers that refer to the redo of failed task, but none that provide an answer for completed task.

Many thanks in advance.