Freeing up space · Stopping, undoing and apps in the way
What does Carry on do after I stop a clear-up?
Short answer: It resumes a stopped clear-up from where it left off; folders already removed aren't touched again.
It resumes the clear-up from exactly where it stopped. Folders that were already removed aren't done again, so nothing is repeated and you don't lose the progress you'd made.
Before you press it, the stopped run shows what was removed and, separately, what wasn't touched — so you can decide whether to carry on at all. See seeing what a clear-up removed.