If profile data has been lost, you can restore it using backup media.
Full restore from the selected backup file
The full restore option restores all profile data using your backup file only. Profile modifications performed after the selected backup file was created will be lost.
Backup priority -- merge current profile and backup
The backup priority option merges the stored backup file with recent profile activity, but the backup information takes precedence. If information conflicts, the stored backup data is restored over the recent profile activity.
Managed system priority -- merge current profile and backup
The managed system priority option merges recent profile activity with the stored backup file, but the recent profile activity takes preference. If information conflicts, the recent profile activity is restored over the stored backup data.