let's say you have a backup set to run every month. last time it ran was 7 days ago and next planned backup is in 21 days. you change the backup frequency to run every night. the backup planning should start from scratch and the next backup should run today at night. currently next planned backup still reflects the old schedule, so in my example the next backup will still be in 21 days while the new frequency is set to each night. some people will be badly surprised by this.