Where are the rules stored in the database?

Hi! I really love the Youtubomatic plugin! Sometimes I have small issues though:  For example, something weird happened when I was editing my long list of rules: One of the rules had the wildcard * in the keyword field. When I removed that * character to test something and hit save, Youtubomatic seems to have deleted the entire row. This brings me to my question: I think I would like to backup my rules in the database before making any more changes to them. But I can't seem to figure out which database table Youtubomatic is using for the rules. Or is there a better way to backup the rules before making changes? Thank you very much!