Agreed, I have an extra phone for gmail authenticator backup, also make sure to secure a pin code, you can use a paper or something and store in properly.
Right using a pincode can save it all.though theres alot of computer experts now that can easily open your pin cone by using technology,what we do is use laptop aside from cellphone or much better to use personal computer so this may assure your safeties because you wont be able to lost the computer in your house