Context: I got a new Mac and transferred everything over using Mac migration, worked great. Dropbox was set up with the new computer, logged in and everything but didn't seem to be backing up on the new computer. Everything I needed was in "in the cloud," so it seemed to be fine. One issue I seemed to have, but am not certain, is that dropbox did not seem to being "reading" my new Mac as a different Mac. I wanted to factory reset my old Mac, it barely works but thought I would give that a try and needed to unsync, to do that I needed to stop backing up my files. So I did that and it gave me the option to keep them in my cloud and delete them off of the computer or delete them on my computer and keep them in the cloud.
From my perspective, they were on my computer in "hard form," not just synced files so deleting them from the cloud would be fine and leaving them on my old mac would also be fine. So I chose to delete them on the cloud and keep them on my old Mac. Suddenly, all of those files were deleted on my new Mac. That put me for a scare but I was able to get them restored in dropbox and they are popping back up on my new Mac now. What I don't understand, is these files were never transferred with Dropbox onto my new Mac, they were transferred when I did Mac migration so why would deleting them on the cloud delete them on this Mac? This aspect of dropbox has scarred me so much it makes me want to avoid using it. Unfortunately, they don't have any reasonable prices for personal, non-business use either so I have not felt comfortable investing further in it. That's a whole different issue though.
So my questions:
Why did deleting them on the cloud delete them on my new Mac? How can I keep them on my new Mac without keeping them in the cloud now? I don't even understand how dropbox got the ability to delete these files on my new Mac because like I said above, I didn't transfer them with dropbox.
Can anyone help me 1) understand what happened and 2) a way to not have my files on the cloud without the risk of them being deleted here again.