Though SMS text messages can be backed up to iTunes or iCloud, the independent messages item cannot be separated out for reading and printing. You cannot view the text messages unless you restore your iPhone from the previous backup to your iPhone 6s plus.
The restoring process, however, is to replace everything currently stored on your iPhone with all the data backed up to your computer or cloud though iTunes or iCloud. In this way, newly generated data that haven’t been backed up will be overwritten and erased forever.
So if you want to selectively export all the text messages and transfer to your Mac, you need a third party iPhone data recovery software that can recover the SMS messages selectively from your iPhone or the iTunes or iCloud backup file for your iPhone. There are dozens of iPhone data recovery software over the market and it is hard to choose one.
According to my personal experience, I would like to recommend iFonebox which is very easy to use and scans your iPhone or backup file with a very fast speed. Besides, it is available for both Windows and Mac users so that you can choose the right version to download and install.
Here are the detailed steps about how to transfer the iPhone 6s plus SMS text messages to Mac computer selectively.
> Install and run iFonebox for Mac on your Mac.
> Connect your iPhone 6s Plus to your Mac.
> Click “Start” after your iPhone is recognized by iFonebox for Mac.
Tips: If your iPhone 6s Plus cannot be recognized by iFonebox for Mac, please make sure whether you have trust the Mac.
> Choose Messages to recover by clicking on the icon of messages from the interface listing all the supported data categories.
> Wait until the data scanning and analyzing is finished.
> Preview the exported messages and click “Check All” to select all the items and transfer to your Mac by clicking on “ Recover to Mac”.