Before I update to IOS 7, should I backup my iPhone 4S?

From what I read, the new software makes things better. But I'm afraid that I'll lose the 8.9 GB used up. To clarify i'm afraid ill lose that all my photos, apps and contacts will be completely gone after I update and I can't use iCloud because its not enough space. Where and how can I backup my memory and I can get it All back after I update.

No you don't

You can do backups on itunes, they will save on your computer

A backup is a good idea but not essential, only a just in case measure

Everything once the update is complete will still be on your mobile.

You should always do this regardless

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