Gmail is one of the very reliable and useful application on which you can trust and save your important files and folders with no security breach.
I really appreciate the security features provided by the gmail where you can set security code which will ask you the security code sent on your mobile device, however, the mobile number should be registered with the gmail settings.
Also one of the best feature is google drive where you can upload up to to 15 GB of your data which can be anything from your pics, videos, documents to important files, however, you need good upload speed to upload these stuffs.
At last, I would recommend everybody to use Gmail and enjoy it’s features.