Systems and methods are presented for modifying scheduled storage of a series as a function of available storage. For example, a media guidance application (e.g., executed on a set- top box) monitors both the viewing progress of previously stored episodes of the series as well as the amount of available storage remaining on a storage device. The media guidance application then calculates, by inputting the current amount of available storage (e.g., 20% available) into a function of available storage, a threshold viewing progress (e.g., 50%). The media guidance application then determines from the viewing progress of the user through the episodes of the series whether the user has met the calculated threshold viewing progress (e.g., the user has watched 50% of the stored episodes). If the threshold viewing progress is not met, then the media guidance application modifies the series recording instruction (e.g., cancels the series recording).