Version 4.8.278 on Windows 7
With FBackup loaded, my CPU keeps maxing out at 100 in the resource monitor, even if no backups are running, and with no active programs running. Usage bounces around, but averages 33+. I removed my 3 backups one at a time down to 0 but saw no visible change in CPU usage. So I have no backups either running or at all, but CPU Usage averages 33 and would presumably go higher if not for hitting 100%.
Slightly disconcerting :-)