I started booting my iMac from an external Samsung T5 SSD as it is a big speed improvement over the internal platter drive. I have noticed the free space diminishing daily on the Ex SSD. I do create some large files and download photos occasionally but I also delete files as often as possible. When I first cloned to the drive the free space was about 717 GB. Now it is at 636GB. Could the rapid decline be a result of the drive being external? Thanks.