I have a 5TB external disk (WD My Book), which I use as my main hard drive. It is always connected via USB to my Mac. I've just bought another 5TB external disk (Seagate backup plus portable), where I always would like to have a 1-1 copy of the whole date from the first disk.
I am looking for an application or a simple way, which does this:
- Everytime I stick the 2. usb drive to my Mac, it should cleverly checks the files which are removed, or added to the first drive, and makes the same changes on the second one. It can of course remove all files, and copy all files from the first drive, but since I have multiple TB data, it will not be efficient. And most of the time, I will have not so many changes anyway.
Thanks in advance!