Launched back when Bitcoin was just coming out of its infancy, the Trezor was the first ever commercially available Bitcoin hardware wallet. Your bitcoins are only safe if the private key was generated securely, remains a secret, and—most importantly—is controlled only by YOU! Later versions work much like resetting old routers. Coinomi is another multi-cryptocurrency wallet that is available for iOS and Android. The wallet also creates automatic backups, so you don’t have to worry about the technicalities of performing manual wallet backups. Plug the USB stick into a computer with no internet access and extract all the files from the drive to the computer. Like the other backups, be sure to write it down and store it in a safe place.