This. If the database just does one ETL job daily and is not transactionally active after that, then perhaps one log backup daily is OK. This is not a common mode of operation, but maybe it is what you're doing. If the database is active, then having a once a day log backup is an invitation to disaster and potentially an RGE (resume-generating event, i.e., you're out looking for a new job).

How big is the database and the log? And is it active? Brent Ozar[/url] has recommended doing log backups EVERY MINUTE. I consider this slightly excessive, but it does have some good reasoning behind it.