Yahooかんたんバックアップ is a free utility tool available for iPhone users developed by Yahoo Japan Corporation. With over 15 million downloads since its launch, this app provides a solution to the problem of insufficient storage space on your phone by safely backing up your data and restoring it whenever necessary. This app backs up your contacts, images, and videos, and regularly notifies you of the backup status. The app automatically backs up newly added or updated images, videos, and contacts, which are then saved in your Yahoo! Box, an online cloud storage service. You can also confirm and save your backup data in the app. Yahooかんたんバックアップ is an excellent tool for users who need to manage their storage effectively and efficiently.