Hello Danil,
Your account does not appear on the exceed-quota list, and you’re currently using a total of only ~5MB of storage space.
I am surprised that you would need to change the name of the experiment to make the save functionality work again. This finicky save behavior is a known problem with the current farm, but we’re moving to a new one very soon, where the problem should no longer happen. Can you confirm that the “Please, try again later” message won’t go away even after clicking the “Save” button many times?
Jeremy