Hmm. That path doesn't seem to work on my Nexus 4 running Android 4.2.2. The closest I could find is Settings > Backup & reset > Backup my data (Backup app data, Wi-Fi passwords, and other settings to Google services). Tapping this, it says "Stop backing up your Wi-Fi passwords, bookmarks, other settings, and app data, plus erase all copies on Google servers?". So, it sounds like it's all or nothing.