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If you have Galaxy S7, you can use Kies for Windows or for Mac to transfer the files. Other recommended solution is to use third party tools like Android Manager [android-mobile-manager.com] and Android file transfer [androidfiletransfer.org].
Both of them support to transfer contacts, messages, videos, photos, music and more.
Works well on all Android modes now in the market: Samsung, LG, HTC, etc.
samsung contacts backup [android-mobile-manager.com]

If you need to backup your phone, I think  it can be easier with an android assistant [mobikin.com], you can transfer or backup text messages, contacts, photos, and other  media files like videos, music files.
Backup android contacts [mobikin.com].
And which allows you to view them on PC, so you can choose selectively and freely.

Many Samsung users will encounter this problem, not able to successfully connect to samsung kies.When samsung kies did not work,you can download samsung kies again to computer. Or you can use Samsung Assistant [samsung-recovery.net] to replace Samsung kies .

Hello.
If you want to transfer, back up and manage your data on Samsung S7, you can try this software to help you.
Samsung data assistant [samsung-messages-backup.com] is a efficient and helpful software, it can help you transfer your data between your devices and  computer.
You can use this software to back up your data on computer, and manage your photos,video, musics, contacts, messages, apps, books. You can edit,delete,or add data by using this software.
After your using of this softwar, you will know how to do.