This might sound heartless, but read the instruction manual.
Anytime you make major changes to your phone, be 100% sure that you have everything before you do.
It's the same problem with OS X and Time Machine. People will experience data loss - one of the most traumatic experiences out there - but, when you explain to them that there IS an option to be able to back up your data then they become upset because it was preventable.
RARELY do people read and fully understand the manual and how to do things that are outlined in it. If they would, they would understand the process.
With Apple, you have 90 days when you get your device to call Apple Care hotline FOR FREE. They will help you set up the backup system - explained in the manual - on the phone.
If it were really important to me, I would do test photos on my mobile device - then sync it to iTunes, then check to see if it worked. That way, I knew.
I would never take a camera to an important event without testing the camera and making sure I could use it. Likewise, I would never rely on a camera to take photos of an important event if I wasn't 100% confident that it served the purpose I needed it to.