I installed Backupper Standard 3.2 a few hours ago and was impressed by the very simple and clean user interface. I first did a system backup of my Windows 7 boot drive, which is 148GB in total with half actually used. The backup went quite quickly, including checkling backup integrity.
So then I started a backup of my second drive which is 500GB, which is 80% full. This backup also started quite quickly. The initial time estimate was 3 hours. Now after a couple of hours it has slowed to a crawl and has only completed 16%. The backup speed is steadily falling every minute and is now reading 7.78MB/s. The initial speed was considerably higher. I did not switch on compression.
Why is it taking so long? The estimated time to complete is now 12 hours (initially 3). If it keeps getting slower, the total time will probably be measured in days by the time it actually completes!
By the way, Windows Task Manager/Performance Tab shows CPU usage at 100% constantly. Any other background task is idle.