At the bottom of the Overview page of your account, there are two installers; 1 for macOS and another for Windows 7/8/10. Click on Windows 7/8/10.
Open up File Explorer and locate the Backblaze Installer file in your Downloads folder. Right-click on the installer and select "Run as administrator".
"Do you want this app to make changes to your device?" Click Yes.
Click Install Now.
Backblaze will quickly analyze your drives and present the success message below. Backblaze will now back up all your data.