As far as I know, the red X comes up on the notification tray after you missed the first time a backup schedule. It won't disappear until you have a successful backup again. But I think Nash wants to be able to "choose" the date when an error appears...
Nash, can you clarify if my understanding is correct? You would like to have a possibility to get an error(like we have today, in the tray icon) but want to be able to choose to get it after X days? For the email notification and stuff, this is a common requested feature and we will probably look into that for v2.
Thanks for your feedback