Select your boot drive (from where you run the tmutil command) Select the Local Snapshot you.Update Nov 24: CCC 5.1.23 can now make bootable backups of a Big Sur startup disk on Intel-based Macs. Your situation will determine where you go from there though.APFS is an Apple file system that is used not only on Macs. With your new bootable Mac OS X installer drive, you are ready to begin the installation process. Install Mac OS X from USB.
Create Usb Boot Drive Upgrade Since TheThe system now resides on a "Signed System Volume". As the numeric change would suggest, though, this is the biggest change to macOS since Apple introduced Mac OS X roughly 20 years ago. As with every upgrade since the original release of Mac OS X, we have to make changes to CCC to accommodate the changes in this new OS. Please keep in mind, however, that your CCC backup does not have to be bootable for you to be able to restore data from it.With the announcement of macOS Big Sur, Apple has retired Mac OS X (10) and replaced it with macOS 11. If you would like to make your Apple Silicon Mac backup bootable, you can install Big Sur onto the CCC Data Volume backup. When Apple fixes that, we'll post an update to CCC that restores support for making bootable backups on Apple Silicon Macs.CCC is a native application on Apple Silicon and is 100% compatible with Apple Silicon MacsCCC will automatically proceed with a Data Volume backup when backing up an APFS Volume Group on Apple Silicon Macs — that's a complete backup of your data, applications, and system settings.Based on that statement alone, and a suggestion from one of my competitors to just give up and use Time Machine instead (which does not make bootable backups, nor back up the System), someone could falsely conclude that it's impossible to have a bootable backup.I think that pessimistic conclusions are also fostered by a concern that Apple is trying to turn macOS into iOS, or otherwise merge the two platforms. Thanks to these massive system changes and some bugs in the version of Big Sur that Apple intends to ship, nobody can make a proper copy of the System volume right now, not even with Apple's proprietary utilities. Does this mean that we can no longer have bootable backups?I can certainly understand why people are concerned about the future of this solution. To create a functional copy of the macOS 11 System volume, we have to use an Apple tool to copy the system, or install macOS onto the backup.Apple has assured us that they are working towards fixing the problems in ASR that prevent it from cloning the Big Sur System volume. Right now you can install Big Sur onto your CCC backup to make it bootable, and in the future we'll use Apple's APFS replication utility (ASR) to clone the Big Sur System volume. But no, we're not just getting a massive new OS this year, we're getting a new hardware platform too! We're seeing a lot of change at a time where we could really use some stability.The changes in Big Sur definitely present some new logistical challenges, but yes, you can have a bootable backup of macOS Big Sur.![]() Here's why I'm really stoked about this new, "proprietary" macOS, and optimistic about the future of bootable backupsEvery year we spend hundreds of hours making changes to CCC to accommodate the new OS. CCC backups are also compatible with Migration Assistant, so you can use Migration Assistant to restore all of your data to a clean installation of macOS (e.g. From snapshots) using CCC while booted from your production startup disk. You can restore individual folders and older versions of files (i.e. Bootability is a convenience that allows you to continue working if your startup disk fails, but it is not required for restoring data from a CCC backup. To put it plainly, we spend about a quarter to half of our year just making CCC work with the next year's OS. All of that time spent is subtracted from the time we can spend on feature work. The logic changes required to accommodate APFS volume groups alone are mind blowing. Ios emulator slowing macWith the introduction of APFS, we've had to leverage more Apple utilities primarily diskutil, a command-line version of Disk Utility. We've been using bless for 20 years! Over that time bless has been adapted to the changing OS and hardware landscape, because Apple uses it too. All the way back to the beginning of Mac OS X, in fact, we'll start with the "bless" utility, which makes changes to the volume headers to make a volume bootable. Asio4all mac downloadAll of this, though, will be neatly wrapped in the Carbon Copy Cloner bootable backup solution. That would create the perfect division of responsibility: Apple is responsible for the copying of its proprietary OS, and CCC is responsible for the backup of your data. Like with the bless utility, Apple has been adapting ASR for APFS, and Apple is going to make ASR work with Big Sur too.In the near future, I expect to be able to leverage ASR within CCC (again) to clone the Big Sur System volume, and then use our own file copier for maintaining backups of the data that actually matters – your data, applications, and system settings. ASR is a utility that Apple has used in factories to "stamp" the system image onto every Mac, and more than a decade ago I developed a mass deployment solution around that utility. Finally, in macOS 10.15.5 we got the "opportunity" to field test another Apple utility that has lurked in macOS since Mac OS 9: Apple Software Restore (ASR). ![]() Again, we're planning to automate that part of the procedure in the future, but we've tested this scenario extensively and we're prepared to support it.CCC 5.1.22 is qualified for use on macOS Big Sur, and this update is free for all current CCC v5 license holders. Once you have that, simply install Big Sur onto your backup to make it bootable.
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