[madeofpalk]

The impressive part about the APFS migration was that they performed dry runs on iOS updates prior to measure success.

> We actually had this process running for earlier iOS updates … where when you updated to 10.1 or 10.2, we were trial migrating your whole file system … consistency checking it … reporting back to us whether the upgrade was 100 percent clean, then rolling it back.

https://www.macobserver.com/analysis/apple-dry-run-apfs-prio...

[detourdog]

I was not impressed with the dry runs on MacOS I had mind bending issues that Apple support could not help with.