With MobileGo for Android, you can easily back up everything on Samsung GALAXY S7, including contacts, messages, apps(app data), calendar, photos, music, videos, etc. Vice versa, you can restore all or selected backup files stored on computer to your Samsung GALAXY S7 at any time.
Also works with other Android phones from Samsung, LG, Sony, Motorola, HTC, Huawei and more
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.