Migration is pain: you can spread it out over days or weeks, or get it over with in a much shorter period. Moving your Time Machine backups also requires great care.
migration
I was startled to discover that a brand new iMac Pro shipped with macOS 10.13.2 pre-installed, and was very reluctant to upgrade to Mojave.
You might want to read these tips before installing the first release of High Sierra. They could save you a lot of pain.
A complex installation, which ran smoothly but failed to convert an external SSD to APFS. Watch for issues in migration, though, which forced me to abandon. And yes, Sierra can still access High Sierra’s APFS disks.
Many of the great painters have been migrants. Here are examples from Canaletto to Sargent. Suppress migration, and art will be stifled.
Maybe when I replace this iMac, I should build my next startup drive from scratch.
The OS X Server and Xcode apps had apparently migrated, and ran normally. But the App Store didn’t think that they were installed. A bug?
Using Installer to see what was installed, and manually removing the different components.
The trials, tribulations, and rewards of being forced to switch to a new iMac. With some performance insights too.
Have you just got a new Mac, or have you just ordered one to replace an old, ailing, or dead one? Here is advice on making the move from old to new.
The Eclectic Light Company 