09-26-2017, 03:11 PM
I installed on top of Sierra on two Macs: one on an internal SSD on a 2012 mini, and the other on a Fusion drive on a 2015 iMac. Both went well.
I tried the first installation on the mini by booting into a thumb drive installer, erasing the SSD and then installing and using Migration Assistant. That was a disaster. Migration assistant managed to migrate only my User name an the containing folder of my account. Nothing else. No settings mail calendar, Safari bookmarks, nothing. And it took over 3 hours to do this "nothing".
I then installed from the same thumb drive on the bootable backup I had just made prior to the upgrade. That worked well, so I cloned that back to the internal SSD and I'm back in business.
I don't know what happened to the Migration Assistant effort. I've used that in th past and it worked well.
The key to my recovery was that I had a bootable backup clone.
I tried the first installation on the mini by booting into a thumb drive installer, erasing the SSD and then installing and using Migration Assistant. That was a disaster. Migration assistant managed to migrate only my User name an the containing folder of my account. Nothing else. No settings mail calendar, Safari bookmarks, nothing. And it took over 3 hours to do this "nothing".
I then installed from the same thumb drive on the bootable backup I had just made prior to the upgrade. That worked well, so I cloned that back to the internal SSD and I'm back in business.
I don't know what happened to the Migration Assistant effort. I've used that in th past and it worked well.
The key to my recovery was that I had a bootable backup clone.