Should I worry about Daylight saving time when planning to schedule backups?

Problem

So if there is a day: https://secure.wikimedia.org/wikipedia/en/wiki/Daylight_saving_time when we have to e.g.: set our clock back from 3am to 2am. Ok. So if someone creates a cron job at 3am, then if a daylight saving day comes, the backup will run first at 3am, then the clock is automatically set…