How to know that I made a backup of my iPhone?

I want to update my iOS version of my iPhone so, I clicked "Backup". Now, how can I be sure that I made a backup? Please ANSWER FAST because I want to update my iOS version faster, I'm in rush!

Go to your itunes folder:/Library/Application Support/MobileSync/Backup/
If you see your phones name in there, or what ever you named the back up, it has been backed up.