On Tuesday Apple announced the release date for macOS High Sierra – we can expect to see it on the App Store on September 25. We've been busy testing High Sierra over the summer, and I'm happy to say that we're ready for it. We've posted an update to CCC 4 that fixes a couple cosmetic High-Sierra-specific issues, and we're preparing to release an update to CCC 5 with the same fixes, plus more improvements that are specific to High Sierra. As soon as Apple posts a "Golden Master" build of High Sierra, we will proceed with our last push to update documentation, screenshots, videos, etc. We'll have more documentation and videos coming in the next couple weeks about CCC and APFS, so stay tuned!
Preparing your Mac for the High Sierra upgrade
Before you upgrade to High Sierra, it is imperative to understand that downgrading to your previous OS will be impossible without a bootable backup of the previous OS. Before you apply the upgrade, we recommend that you establish a bootable backup of your current OS on an external USB, Firewire, or Thunderbolt hard drive, then verify that you can boot your Mac from that backup disk. Before you pull the trigger on the upgrade, detach that external disk from your Mac and set it aside.
For more detailed advice on preparing for the upgrade and instructions on how to downgrade, check out this CCC knowledgebase article:
Preparing yourself for the High Sierra upgrade
Perhaps the biggest change in macOS High Sierra is the new filesystem that Apple will be applying to your Mac's SSD/Flash-based storage upon upgrade. This change will be mostly transparent for many users, but if you have several disks, complex partitioning, or if you're just curious how these things work, you might want to take a moment to learn more about this new APFS filesystem. Apple offers a couple helpful APFS-related knowledgebase articles here:
In regard to how CCC will work with your APFS-formatted volumes, this CCC knowledgebase article aims to answer all of the questions you might have on the subject:
If you have additional questions, please let us know! You can reach us right from within CCC — choose "Ask a question" from CCC's Help menu to receive personalized support from our Help Desk.
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