A factory data reset erases your data from the phone. While data stored in your Google Account can be restored, all apps and their data will be uninstalled. To be ready to restore your data, make sure that it’s in your Google Account. Learn how to back up your data.

Does a factory reset delete everything?

When you do a factory reset on your Android device, it erases all the data on your device. It is similar to the concept of formatting a computer hard drive, which deletes all the pointers to your data, so the computer no longer knows where the data is stored.

Is factory reset good for Android?

It will not remove the device’s operating system (iOS, Android, Windows Phone) but will go back to its original set of apps and settings. Also, resetting it doesn’t harm your phone, even if you end up doing it multiple times.