Things you can recover include anything from call logs to messages, calendar entries, and of course, media files. Choose what to recover, set the export path, and wait for it to finish. It will then run its course and provide you with results in a directory-like breakdown. Once found, you can tick boxes corresponding to the type of file or data you want to recover. This app starts with a device scanning screen wherein you need to plug in your device so it can detect it. However, if that's not the case, you still have options to possibly remedy the situation with the help of data recovery tools like PhoneRescue for Android.
Depending on the type of user you are, this is not a big concern if you frequently back up. Over the course of using your smartphone or tablet on a daily basis, accidental deletions or data loss is par for the course.