Functionally, I don't see any major difference between the two. Seriously. However, since we're dealing with human beings, I agree with you. Never over-write an existing back-up, using a single backup per file, name the backup files meaningfully so that you can find them later and understand what they are (usually this entails using a date as well as the db name)... All very good practices to prevent human beings (or me) from screwing up.