The antonyms of "back ups" are "frontline" or "primary," indicating the first line of defense or the initial choice. Other antonyms include "lead," "foremost," "top," and "first-rate," emphasizing the importance of being in front or on top of things. Conversely, "secondary," "backupless," and "unprepared" could be classified as antonyms of "backups." These words describe a situation where there is no contingency plan, leaving one vulnerable and exposed to potential failure. In summary, antonyms of "backups" convey the idea of being in front or ahead of something, rather than being at the back or in reserve.