Helium Backup

Helium backups are backups made by the Helium (previously Carbon) backup software by ClockWorkMod, who also made Vyzor and CWM recovery.

Details
/storage/emulated/0/carbon/ contains subdirectories of package ids. Package IDs of interest: com.android.providers.telephony contains call related data. com.android.providers.userdictionary contains… you guessed it. User dictionary data. Each folder contains 4 files. Both are titled the package ID. The file of interest is the .ab file, which is an Android ADB Backup, second is a json with metadata. There is also the app icon an a nomedia file.