I tried to use it and it freezes also, never stops :-(
I have bought a NEW server and installed NEW Plesk 11 on it (still 19 days trial), piut my 40 domains on it, and tried to make server back up. Freezes (stops) again at 10.29%, backed up 2 domains and then stops.
I am a little angry by now, because clearly there is some fault in plesk 11, I never had problems like this before. And my plesk now is 1 day old, should have back up ok, I have not installed or changed anything like I did before on the old server (updated mysql manually etc.).