Hi Michael, here is a link to a discussion about backing up and syncing the 
iPhone and computer. Basically, when syncing your iPhone, its is backed up 
first. You have a choice of syncing music, photos, etc. You will be given these 
options when you attach your phone.

There are other discussion pages as well on this topic. I found them using 
Google.

https://discussions.apple.com/thread/2766292?tstart=0

cheers, Susan.
> On 3 Jan 2016, at 4:57 PM, Michael Hawkins <[email protected]> 
> wrote:
> 
> I'm a tad confused about the advantages and differences between backing up my 
> iPhone and syncing my iPhone. 
> 
> I avoid technological clouds  of any description as much as I can, and so I 
> assume if I backup my iPhone I plug it in to my computer and save the entire 
> contents into iTunes. 
> 
> I also assume that if I lose or destroy or break my iPhone somehow, I can 
> download to the replacement iPhone the content saved on my MacBook Pro, 
> including photos and videos.
> 
> I think that if I sync my iPhone to my computer, all I do is transfer from 
> the computer to the iPhone photos that aren't on the iPhone and content in 
> iTunes from he computer to the iPhone that isn't in the IPhone, and 
> vice-versa.
> 
> Syncing: What happens to music I've got on my computer, that I didn't buy 
> through iTunes? By law I'm allowed to copy a cd I have bought. Does it get 
> transferred to my iPhone when I sync the phone with he computer or, if it's 
> music get is not on the iPhone, does syncing mean that it gets removed from 
> the computer?
> 
> And how do photos fare? I've got hundreds of photos on the computer they 
> aren't on the iPhone, and dozens on the iPhone that aren't in the computer. 
> If I sync my iPhone  with the  computer  does it mean that photos get removed 
> from my computer if they're not on the iPhone?
> 
> Cheers,
> 
> Michael
> Sent from my iPhone
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