In the mobile app, starting from V.4.0.4 (Android) / V.4.0.7 (iOS), you have the possibility to backup your photos and/or videos. 

1. Open your app, and you will see all the shares you have access to, and tap Settings.

2. In the Settings menu, tap Backup.

3. Select where you want to backup your photos and/or videos.
    Select the photos / videos you want to backup.

    You also have the option to set Auto backup on your photos and/or videos.

4. Go back, and find the folder you chose to backup your photo and/or videos in.

    The backups are now visible in this folder.