Hard Drive / System Clone

I don't seem to be able to clone my internal Hard Drive to an external drive to use as a bootable backup and "portable" version of my hard drive. Both are APFS format drives. I am running System 10.14.6 Mojave on an iMac and trying to clone to an SSD external drive. I am following the process of starting up to Disk Utilities and going from there but the process keeps failing. Mac OS Journaled is not available as a choice when I format the external drive, so maybe that's the problem?

iMac 27″, macOS 10.14

Posted on Aug 15, 2020 1:29 PM

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Posted on Aug 15, 2020 2:08 PM

I understand you want to use Disk Utility's Restore function, is that correct?


Restore a disk using Disk Utility on Mac - Apple Support


That's the right way to do it but if that process fails for whatever reason I suggest using asr (Apple Software Restore) using Terminal.


Example below, using a previously erased hard disk drive with title "Untitled" (the name provided by default upon erasing a disk):


sudo asr restore --source / --target /Volumes/Untitled --erase


At the Password prompt type that Mac's Admin password followed by the Return or Enter key. What you type will not be echoed, not even with •••• characters. Just type the password and hit Return.


The --erase flag seems to be necessary despite the fact you just erased that disk.



Here is an example of what you ought to see upon entering that command


iMac11:~ john$ sudo asr restore --source / --target /Volumes/Untitled --erase
Password:
	Validating target...done
	Validating source...done
	Erase contents of /dev/disk3s2 (/Volumes/Untitled)? [ny]: y
	Repartitioning target device...done
	Replicating ....10....20....30....40....50....60....70....80....90....100
	Replicating ....10....20....30....40....50....60....70....80....90....100
	Restored target device is /dev/disk4s1.
	Remounting target volume...done
iMac11:~ john$ 


The result will be a bootable exact precise duplicate copy (often referred to as a "clone") of that Mac's startup disk.

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4 replies
Question marked as Top-ranking reply

Aug 15, 2020 2:08 PM in response to StudioZ

I understand you want to use Disk Utility's Restore function, is that correct?


Restore a disk using Disk Utility on Mac - Apple Support


That's the right way to do it but if that process fails for whatever reason I suggest using asr (Apple Software Restore) using Terminal.


Example below, using a previously erased hard disk drive with title "Untitled" (the name provided by default upon erasing a disk):


sudo asr restore --source / --target /Volumes/Untitled --erase


At the Password prompt type that Mac's Admin password followed by the Return or Enter key. What you type will not be echoed, not even with •••• characters. Just type the password and hit Return.


The --erase flag seems to be necessary despite the fact you just erased that disk.



Here is an example of what you ought to see upon entering that command


iMac11:~ john$ sudo asr restore --source / --target /Volumes/Untitled --erase
Password:
	Validating target...done
	Validating source...done
	Erase contents of /dev/disk3s2 (/Volumes/Untitled)? [ny]: y
	Repartitioning target device...done
	Replicating ....10....20....30....40....50....60....70....80....90....100
	Replicating ....10....20....30....40....50....60....70....80....90....100
	Restored target device is /dev/disk4s1.
	Remounting target volume...done
iMac11:~ john$ 


The result will be a bootable exact precise duplicate copy (often referred to as a "clone") of that Mac's startup disk.

Aug 18, 2020 5:16 AM in response to StudioZ

John Galt's suggestion may obviate this, but it sounds like you didn't use a GUID partition table when you erased the drive (I don't know how you would get an APFS option if it wasn't, though).

In Disk Utility, use the View button to "Show All Devices." Then select the SSD device from the list and erase that. You should be able to change it to GUID partition scheme and have all of the macOS formats available.


Again, I don't think you can get APFS without GUID, but I don't know why there wouldn't be an option for Mac OS Extended (Journaled).

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Hard Drive / System Clone

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