This is unclear in the manuals. Regarding deleting differential backups files. Example situation. I have a full backup followed by 8 differentials, made on the 8 days subsequent to the full backup. Today's file is number 8. I assume it is safe to delete differential files 1 through 7, inclusive, because if I have the original full backup and the 8th (or most recent) differential, then I can restore completely to the time the 8th differential was made. Am I right?