Hi, i need something that would backup just one of my drives, excluding internal one. Internal is apple SSD and am pretty confident about it, but external is 2TB RAID0 with a lot of data and I'd need a solution thats pretty simple: every time i plug in the external drive, the software checks the source external and copies all the changes over.
The app Carbon Copy Cloner can be configured to exactly what you described. Setup the disk source and destination then do a "schedule task" and configure that to run when the destination drive is detected.