Special SCSQL backup files for full backup and transaction log only backup. A transaction log backup is a record of the database changes that have occurred since the last transaction log backup. SCSQL...Special SCSQL backup files for full backup and transaction log only backup. A transaction log backup is a record of the database changes that have occurred since the last transaction log backup. SCSQL supports transaction log backups in order to provide Up to the minute (UTM) backup and to recover the transactions committed since the most recent full backup SCSQL creates a backup of a transaction log by copying transaction log data to a file in the Host Log Directory (HLD).