How to sync my iPhone 4 to a new computer without losing all of my photos?

I have an iPhone 4 that was synced to my PC which, unfortunately has now crashed. I now have an iMac and would like to be able to update my music on my phone but I'm afraid to sync it and lose all of my photos/contacts. I don't care so much about the music as I've been in the process of re-downloading all of it anyway but how can I salvage the 4K photos as well as all of the contacts I have? They're not saved anywhere else and I really don't want to lose them.

Go to technical expert.

N this article, I tell you a nice and quick way of backup your music and more files from your iPhone to computer. Using iPhone Files Transfer is the good way to transfer iPhone data to new computer without losing everything. It is an excellent program to copy and move files between iPhone and PC.
iPhone Files Transfer can easily transfer and sync iPhone songs, videos, photos, SMS, call list, contacts and books(you purchased via iBook Store) to computer. And even enable your iPhone as a removable hard disk. It supports all kind of iPad, iPod as well.
Here we will show you how to transfer music, videos, photos and other files among iPhone, PC and iTunes step by step.

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