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?

Only one speaker on my iPhone 4s plays music?

I'm new to iPhone's, and I just got this phone 3 days ago. I have never dropped it, but it sounds like only the right speaker on the bottom of the phone plays music. Is this normal? Should I get it checked?

Why is my iPhone saying I have so much storage used?

I'm trying to download iOS7 and it takes 2.9 GB of space. My phone says I'm using 5.7 GB of the space but I have no music, no photos, no videos, and my apps only take up 288 MB. I also deleted all of my messages and and recent calls. Any ideas?

Do you get a fully charged icon on ios 7?

I charged my iPhone for the first time running on ios 7 and when it reached 100% there was no fully charged icon as there was before the update and I was wondering if there was one on ios 7 and if not how will I know when it's fully charged at 100%

Why does Netflix keep pausing and playing over and over?

I'm using it on my iphone 4. And I have checked my connections over and over I've uninstalled reinstalled, signed in signed back and everything else that the troubleshoot website has recommend. And it's gotten annoying. It didn't start doing this as much until I updated the app before the ios 7 release. I'm currently using the trial for netflix and my laptop doesn't work so I can get it on anything but my phone.

If i buy an iphone now, does it have the update?

Okay so i have to wait a while to get a phone and i wanted an iphone, but i don't really like the new update how everything looks… If i buy the iphone 4 or 5 in a few months will it have the update or will it be the old version?

Thinking about upgrading to the iPhone 5s?

So I got the iPhone 5 a while ago and I like the new features on the iPhone 5s. Since I signed a 3 year contract with fido, would I be able to buy the phone elsewhere and just put my SIM card in the new phone. Can I do this or do I have to confirm with fido and sign a new contract? I'm currently paying 70 dollars monthly with the iPhone 5 with 2GB data, 100 minutes US/Canada and free messaging. Say basically I just want to buy the phone off of like kijiji or something and simply place my SIM card from the iPhone 5 to the 5s. Will this be a problem?