Backup to an external drive

Hi everyone. So I finally fixed my minipc’s raid setup. I set it up as RAID 0(4tb x3) total to 12gb of storage. I know you will say “why not raid 5” for redundancy. Yes I am aware that I can do that. What I wanted is I have a 3.5 12TB hdd that is on an external enclosure. Since the 3.5 drive would not fit inside the mini pc, I wanted to have some sort of backup of my RAID 0 going to the external drive. Is there a feature of ZIMAOS for this type of function? How about a docker app? I want to have scheduled backup, that backup only the changes from the RAID 0 or any suggestion is welcomed. Thank you very much…