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Recover Sierra partition after upgrade hang

I attempted an upgrade from the App Store yesterday, but got stuck at around 3/4 of the way. Still had a couple of minutes left, but I figured it was stuck and pressed the power button.

Now my Mac will boot directly into Bootcamp and will not display the Mac drive when I hold Option booting up. I figured this was the time to reinstall macOS through Recovery, preferably the latest version.

Turns out that even after pressing Option+Command+R the Recovery option to install macOS will open the installer for Yosemite (my Mac is a late 2014, I believe).

With these developments, I think my only option is to do a fresh install of macOS, but I would like to back up my data. Would that be possible? Should I use the recovery menu?

最后更新：2017-09-27 00:41:28

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