Anshin Backup is a free utility and tools app developed by ソフトバンクモバイル株式会社 for Android devices. It allows users to easily backup their data, such as phone book and S! Mail, stored on their SoftBank smartphones. The backed-up data can be saved to a secure server (cloud) or the user's SD card, both of which are managed by SoftBank. Users can also restore the saved data back to their smartphones.

For SoftBank smartphones running on Android 2.3 to 5.1, Anshin Backup enables the storage of call history, photos, music, and video data on the SD card. It is worth noting that this app is an updated version of the SD card save and load application provided by SoftBank.

For SoftBank smartphones running on Android 6.0 and above, Anshin Backup offers the same features as the previous version, with the addition of other functionalities such as periodically save settings, contact change notification emails, and S! Mail anywhere access export (requires main service subscription). However, bookmark save and restore cannot be performed on this version.

Overall, Anshin Backup provides SoftBank smartphone users with a convenient and reliable solution for backing up their important data.