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Colmuster Samsung Backup is a powerful data manage program that help backup Samsung Galaxy S7 [samsung-messages-backup.com],such as contacts, text messages,apps, photos, music and more on Windows or Mac.It also helps to manage data from Galaxy S7/S6/S5.

If you lost data from your android phone, check out the backup, whether
you have synced the data to Gmail account, or saved on your pc.
Then, you should never add more data to your phone after data loss, cuz
they can take up more space, the lost data will be overwritten.
Last thing, you can try recovery methods, Recuva, I noticed that some
people said it was helpful. But , if you think it is not useful for you,
you can also try professional  android data recovery [mobikin.com] programs.

This android backup assistant [mobikin.com] is a helper for data backup.

To backup samsung galaxy data to computer [android-file-manager.com], you can use a special designed android data transfer app to help. This kind of app could transfer everything from your phone to computer.

Well, there're many methods to backup your samsung galaxy files to computer. But if you want to backup all these data to computer just in one click, you may use a third party app to help. 
how to backup samsung contacts to computer [data-recovery-master.com]