You don’t really save anything.
You use a fairly huge amount of network capacity (think about a business where there are 1,000 computers/users that read about 8gb for running Windows OS!) and once you download it, any network disconnection puts you at risk of data loss.
Then, in order to fix that, one gets a great idea to install a small (e.g. 8GB) flash disk in the system, and saves the state locally, which returns you to square one. Almost, that is, because you still spend time waiting for stuff to sync up.
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