I have a mid-2012 MacBook Pro running Catalina. I was trying to clone it using the free version of SuperDuper!, but since after 21+ hours of backing up the end was still not in sight I stopped it. Now (after restarting) I have only about 15 GB of memory available, whereas before I had about 60-70 GB. How do I go about getting that missing memory back? Any help will be greatly appreciated.