Reinstalling Hearthstone after Windows 10 Upgrade

[Twoddle]

Can you backup Hearthstone to a DVD like you can with WoW and then copy it back after? Or do you have to download a 2GB install file again after upgrading to Windows 10?

Edit:
I meant to say after doing a full format reinstall of Windows 10 not just an upgrade.

[otinar]

Yes, you can copy to another drive/usb/dvd abnd copy it again when you finished installing Windows 10.