The backup scheduling for week and month doesn't make much sense at the moment, as we can't select which day to run, only clock time.
For weekly there should be a simple selection of the week day (Mon.-Sun.), while for month it would make sense to be able to set it to t.ex. the first or last day of the month, a specific date, or even t.ex. the first Wednesday in the month - to ensure it doesn't run on t.ex. a Saturday evening when nobody is available the next day in case shit hits the fan... ;)