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Setup will automatically start again, or if it doesn't, you can restart it manually -- but it remembers where you left off, saving you from doing it all over again. This step isn't necessary, but it does give the end user peace of mind.
The checkboxes appear and it's clear as to what is going to happen next. At this screen, Windows wants to be left alone to its own devices (pun intended) so it can carry on installing the next version of Windows.
Going full screen, this step only took about ten minutes. It does not give details unlike previous versions of Windows did, but it effectively copies all the files necessary to disk so that it can progress through the setup motion faster.