Will I be able to use the current version of CCC on Apple's next OS upgrade?

We hear this concern frequently:

"I'm considering buying CCC, but I am concerned that a new OS will come out and I will be asked to purchase a new license to continue using CCC."

Thoughts about progress indication

Carbon Copy Cloner has two different methods of providing progress indication, "fast" and "more accurate". "Perfectly smooth progress indication every time" is what many people want, along with an estimate of how long the task will take, but they often don't realize the cost to achieve that for a backup task that copies only items that have changed since a previous backup task.