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Originally Posted by asleyam
... One of my older iMacs has a dead internal drive, but the iMac itself is still functional because it boots directly into the external clone and treats it as if it were the internal one.
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Oh, wow. I didn't realize one could do something like that. Good to know. Thanks.
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So basically, if you only need to backup files and restore from time machine, you don't need to clone.
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Got it. I have backup processes already in place. I don't think I need a clone at this time, though knowing what a clone can do is eye-opening and something I will remember for the future.
For now I want to create a bootable external drive running a different macOS (e.g., Catalina beta) than my primary Mac so that I can experiment and test without compromising my primary Mac. Everyone on this thread has been helpful teaching me this. Thank you to all!!