[wyldfire]

iOS downloads updates in advance of you agreeing to executing them. Maybe OS X does the same?

I suppose iOS, Windows, and others all have an opt-out for this feature.

[crishoj]

Since iOS 7 or so, iOS updates have been incremental, sized in megabytes, not multi-gigabyte blobs.

[kalleboo]

iOS 8 was a 1 GB update (or even bigger for some devices)

[wyldfire]

Sounds like a great feature.