How to make sure updating to iOS 7 won't delete my stuff?

I no longer have the computer that syncs with my iphone so I haven't been able to back up to it in about half a year. I'm afraid if I update without backing up anything (mainly my music) that it could delete everything. Even if it did delete everything, I would have no way of getting it back since I don't have that computer anymore. Should I just not update just to stay on the safe side?

What is your question here? How do you make sure, or should you update?

There's no way to be sure if you are unable to back everything up, but it is highly unlikely.
If you are interested in the new operating system, then yes, you should update.

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