What will happen if i don't backup my Iphone files after updating my Iphone?

So i had an iphone 4 and i tried updating it to IOS 5.1 and after updating it told me to backup my files so i backed up and it is taking forever to back up it has been like an hour the bar did not even move it moved a little from the start. Can i chose not to backup will anything happen if i don't back up?
I currently used 29.1 gb space in my iphone

Added (1). I only have one place to store my stuff
382 GB of 451 GB used

How to jailbreak and get pokemon on my iPhone?

Okay I'm not sure what the latest jailbreak is or if you can still get pokemon. If there's a certain Jailbreak version I have to get please let me know and leave links to where/how I can do this. Thank you to everyone and anyone who helps me out.

Updating software on iPhone 4?

If I plug my phone into iTunes and update it to the newest iOS, will I lose everything on my phone? Like photos and apps?

I have about 400 pictures/videos on my iPhone, but it's taking up 6GB of space?

I have an iPhone 4S, and I believe that maybe one of the pictures is in HD? I'm only asking because I ran out of room on my iPhone, but my sister has almost 1000 pictures and just as much music as me. Is there anything I can do other than deleting all my pictures to make room for music?

Added (1). I've been deleting apps instead of videos and pictures. Is there any way to get longer videos onto the computer? I have a couple from a concert at my school but thats about it.

Can't get signal on my iPhone 4s?

I haven't had signal since yesterday it just says 'Searching… ' all the time. Also since Thursday I don't get 3G or E or whatever the connection is where I'm. Even when I had signal I couldn't get on the Internet. Should I contact Orange or is it the actual phone?:/

Can i unlock a second hand iphone from vodafone network?

Just like the title. I want to buy a second hand iPhone and be able to use it on a different network carrier. I know there are a lot of programs, chips etc you can use to unblock the network but say for example if the current owner of the phone has a recently purchased contract on the phone for 18 months, can it be unlocked without waiting them 18 month contract permanency?

How to access FaceTime on iPhone 4s?

I have an iPhone 4S. So I should have FaceTime

But I don't think I do. When I look under settings, I don't have it. When I click contacts and look for FaceTime under them, I don't have it either. How can i access it?