If I update iTunes, will I lose the backup stored on it?

I recently purchased an iPhone 6. I previously had an iPhone 4S and an older version of iTunes. Before going to the Apple Store, I backed up my phone onto my laptop (not the cloud.) When I plugged in my 6 to restore the backup, a popup came up saying I had to update iTunes in order to sync this iPhone. I'm just wondering if the backup will be deleted if I update iTunes. Any help?

No you won't. Just the iTunes itself will update. You will have all your music still and everything

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