Hi, I'm setting up a backup system for my MBP now. I have a 500GB harddrive in my router that I currently use for Time Machine backups, mainly because if I need to revert back a file or something. But I also got a USB 3.1 SSD drive with 256GB (the same size that the SSD on my MBP) and I'm wondering if I should use it for CCC? It should bee nice to know that if my MBP crashes I can just plug the external drive in to an other MBP and run the system. But I have some questions regarding the CCC. Can I exclude folders in the backup? Does CCC write over the prevues backup or does it make a new IMG file every time?