10.14.1 update conundrum

[2stepbay]

I just learned Fusion Drives are now updated to APFS upon Mojave install. Don't remember seeing any Apple notice about APFS compatibility. Is the convert to APFS automatic, or would that be something I would have to select? If the former, seems my SSD drive ought to be APFS as it was cloned from the iMac after the Mojave install. However, Disk Utility indicates the SSD external drive is not APFS. Appreciate any insight. Thanks

[dnanian]

It's all automatic as far as I know. But it wouldn't convert an external to APFS, since you didn't actually run the installer on that drive.

[2stepbay]

Thanks Dave. So to be clear: cloning the Fusion drive to the external would only carry across the APFS if the external drive is formatted for APFS. Is that correct?

[dnanian]

"Carry across the APFS" isn't really the way to think about it. Because we're copying files - not the "disk format".

I would format the external as APFS if the source is APFS.

[2stepbay]

Thanks for the confirmation.

[t3rockhall]

So, I have a new iMac still in the box
I boot from my HFS SD! backup of old Mac
And write everything over to the new mac
Then upgrade the new Mac's OS if needed
Then, when the new Mac is running properly
I should reformat the SD! External drive as APFS
And then back up the new Mac to the external drive

Or is it unnecessary to reformat the drive?

[dnanian]

No. You should migrate from the backup (see https://www.shirt-pocket.com/forums/...ead.php?t=5476).

Then, yes, I would reformat the backup as APFS.