ASR is also available for macOS Mojave and earlier, but you’ll need to use the command differently than what is described here to clone your startup volume. This guide assumes that your Mac is running macOS Catalina (10.15) or later.
What macOS versions does this guide cover? If you still need an exact clone of your Mac's system, follow the steps in this guide to create one. If you would like to have a second copy of macOS available, it’s easier to erase your destination appropriately (APFS as format, GUID Partition Map as scheme if prompted), install macOS onto it, and then import any desired data when prompted. If you don’t feel comfortable with this, don’t use these steps. This user tip details the overall process for creating a clone using ASR and provides an example case.Ĭloning your Mac via ASR requires using the command line (Terminal), and being able to work with disks, partitions, and volumes. There is only one tool that can successfully copy the Signed System Volume, and that is Apple Software Restore (ASR). Unfortunately, the cloning process has become more difficult because of the Signed System Volume in macOS Big Sur and later. In certain circumstances, it can be helpful to create a bootable clone of your Mac or macOS system, especially for testing software or system changes.
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