Server does NOT resume backup

After connection is lost to my backup server I have to reboot the server. The full image backup that was running on the client and was 67% complete does NOT resume. The backup starts all over from scratch. Is that the normal behaviour ? Not very good…

I have abandoned urbackup… The image backup runs too slow on my 100Mb/sec network and the server locks up frequently on my nas to run a reliable backup !
There is no resume on the image backups so onto next backup solution.