What happened to my iPhone update?

So I have the iPhone 4 and yeah it's pretty old and I had never updated it before so today I decided that it's about time I do. So I plugged it into my computer and it asked me if i wanted to download and update the software so i clicked yes and it took like 4 hours to do so I sat here waiting for it, and then it said something like 'everything on iPhone could not be backed up, do you wish to continue?' so i went ahead and said yes. But then after another 10 minutes it said something like 'an error has occurred, back up failed' and then nothing happened so i switched off my phone then switched it back on and it just asked me if i want to update the new software so i clicked yes and its backing up my iphone at the moment. Will the same thing that happened the first time happen again? Why did it happen?

Sounds like your iphone was jailbroke… You can't update a iphone that was jailbroke to ios 6

Do you have jailbreak your iPhone before. If you done, that's a usually issue.

But if you doesn't do that. May this because
1. Your internet connection
2. You iPhone was have a problem before
3. You do some mistakes when you follow the instrucsion.

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