How can I sync my iPhone on my macbook air without deleting everything on my iPhone, How can I sync my iPhone on my macbook air without deleting everything on my iPhone

How can I sync my iPhone on my macbook air without deleting everything on my iPhone, How can I sync my iPhone on my macbook air without deleting everything on my iPhone

The application ITunes presumes that the information, data, music, etc in its database is the correct master. In doing so, it will overwrite and replace any information previously on the phone. You probably will want to transfer the iTunes data directory from it's original location (presumably the system yoiu used to sync with your iPhone previously), the the new system.
If your iPhone has data from a different Apple ID, than the ID you will use on the new notebook, then be prepared to lose the data on the phone if you sync. It's meant to work that way.

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