Restoring iphone, but keeping apps and contacts?

It was getting a bit slow, and I want to restore it so its clean and fresh.

My contacts are synced through icloud, so how will I get them back when the phone is restored?

also, my apps will still be in itunes so I can resync them as well correct?

Do a back up in iTunes before & then restore from that backup after. Yes it will sync the apps & their data back.

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