I am often unable to delete emails from my Inbox while NOBU is running. I'm using Seamonkey 2.16 email, which is code similar to Thunderbird. How can I avoid this problem? It's making my wife and I nuts.
Try changing your backup schedule to backup in the middle of the night. You can get there by clicking on "Settings" and on the next page choosing "When". In this view you would change your backup schedule to daily and then choose the general time of day.
If this resolves your issue please mark this thread as solved.