Does it automatically save the repetitions on my pc? If so, how do I delete them
Go to the folder in which you saved fortnite there should also be your saved recordings.
Moin, go to Fortnite and go to Settings. There's the repeat category on the 2-3 page above. You have to see through.
You can delete them by going to the repetitions in-game and then there's something to delete.
In your place I would delete FN and reinstall it, then the 90gb times can quickly become 40gb…