We’ve got the Android M preview installed on some devices already, and we’re beginning to dig down past the major improvements that Google announced on stage earlier today. One of these is an improvement to Android’s backup system—if you choose to back up your device with a Google account, apps that target Android M and newer will have all of their data and settings backed up by default. That data can then be downloaded and restored to your phone if you get a new one or need to wipe it for some reason.
Read on, source: Android M makes another attempt at automated device backups | Ars Technica