alt Hacker Newsnot surprised about the chrome part, but pretty shocked at the phone OS part. I know APFS migration was done in this way, but wouldn't storage considerations for this be massive?
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marmarama • today at 9:01 AM
Not really, because only the OS core is swapped in this way. Apps and data live in their own partitions/subvolumes, which are mutable and shared between OS versions.
The OS core is deployed as a single unit and is a few GB in size, pretty small when internal storage is into the hundreds of GB.
what would be more massive would be phones not booting up because of a botched update. this way you can just switch back to the old partition