No jailbreak required. This app is on the App Store. It's not like Android. Much less if any proneness from viruses. I wouldn't worry so much about this on an iPhone. JMHO. And to backup your phone, go to your iCloud settings and make sure iCloud backup is ON. Then make sure you connect to a WIFI network and then go back to iCloud backup and backup he phone. You will also have the option of what you want to back up such as contacts, photos, and so on. Hope this helps. Good day