Restore Mac from a disk image backup. Disk Image is Extended journal and computer is APFS. How would I go about doing this?

nfarbs_01 wrote:

It wasn't back up via time machine. It was done as a copy of the HD in Recovery mode to a attached external hard drive.

Use DiskUtility Restore feature https://support.apple.com/guide/disk-utility/restore-a-disk-dskutl14062/mac

You don't have to over think it.

https://support.apple.com/guide/disk-utility/restore-a-disk-image-to-a-disk-dskutl14078/19.0/mac/10.15

Are you having some issue?

nfarbs_01 wrote:

I tried this and it failed because it is extended journal and my computer is APFS.

Thanks, Interesting short coming in using the old Restore disk image.

Is this your only backup—3-2-1 Backup Strategy: three copies of your data, two different methods, and one offsite.

Boot clone https://discussions.apple.com/docs/DOC-10081

How to use Time Machine to back up or restore your Mac: https://support.apple.com/en-us/HT201250

Use DiskUtility Restore feature  https://support.apple.com/guide/disk-utility/restore-a-disk-dskutl14062/mac

Depending on your issue(?) you can boot to Recovery and reinstall the macOS, leaving your data files untouched.

How to reinstall macOS from macOS Recovery: https://support.apple.com/en-us/HT204904

If you are trying to revert to an older macOS (HFS+) you can reformat the internal HD/SSD using the DiskUtility from Recovery.

caveats might be if the machine is brand new and shipped with Catalina. There are some instances where you can still fall back to Mojave.

You do not really paint the big picture—just crumbs of whole issue.

What the backup is on doesn't matter.

If you restore the entire disk, it will format the drive with the format of the backup.

The format of the backup has nothing to do with the format of the backup image/drive.

Just boot into Recovery or Internet Recovery and restore from the Time Machine backup.

nfarbs_01 wrote:

Unfortunately it is as my external hard drive with my time machine back ups failed. Ill try and see if any of these suggestions work. Thanks.

I consider TM a finicky mistress—Time Machine is great when it works, not so much when it doesn't.

These ASC are littered with similar experiences when TM goes side ways for varying reasons.