We posted a beta of CCC for El Capitan beta testers back in June and I'm happy to report that our testing of CCC 4.1.4 (beta) has been going well on the new OS. So far we haven't found any significant problems. We've made a couple adjustments to how the Recovery HD partition is cloned, but that change was relatively minor. Backups are bootable, scheduled tasks are running on schedule, smart updating is updating smartly, backups to network volumes are working great. On the whole, this appears to be a low-impact OS change. That's perfectly fine with me, I can spend my summer on new feature work!
Help us test!
If you're participating in Apple's El Capitan beta testing program, you can help us test CCC on the new OS. To access the CCC beta update within CCC (e.g. before installing the El Capitan beta), open CCC's Preferences window, click on Software Update, check the Inform me of beta releases checkbox, then click the Check for updates now button. If you're already running the El Capitan beta, you can download the CCC beta directly [NOTE: no longer available].
If you're using CCC on El Capitan, please let us know what you think and inform us of any problems you encounter while beta testing by choosing Report a Problem from CCC's Help menu. If anything looks or feels a bit different (or just plain wrong), don't assume that we know about it. If you don't report it, it might not get fixed. Thanks!
Update: CCC 4 is qualified for El Capitan
On September 1, we posted CCC 4.1.4, which is now fully qualified on OS X El Capitan.