Android Recovery Mode Backup
Android Recovery Mode backups are files created by older versions of Android used to backup user data in recovery mode. This is useful in cases where system files are corrupted and you need to factory reset, but need to keep your data. Go to the recovery mode in older versions of android before Ice Cream Sandwich to backup these to an SD card. However, you need an SD card big enough and an SD card that is compatible with your phone and OS version. It is mostly unknown what these files are. I don't even have a sample. Try extracting one with the 7Zip software. Backups may be split into smaller backup1 and backup2 and backup3 and etc files. It is normally named userdata_yyyymmdd_HHMMSS.backup. Only some devices like this one and that one has backup options.
