Will my iPhone camera roll be deleted if I sync it to a new computer?

I just got a new laptop & am wanting to sync my iPhone to it, but my phone is currently synced with my current laptop.

I'm just wondering, what will happen to my camera roll, contacts etc if I synced it to the new laptop.

Must I back it up first before doing anything?

You get to select that, but if you sync you'll lose your music thouhg (hate it)

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