If I want to shut down the pc but the download is not complete, can I choose
'pause' and the next time I power up the pc, choose 'resume'? Will I lose
previously downloaded files?
Since I'm shutting down the pc anyway, does it make any difference if I choose
'cancel' instead of 'pause'? 

Also, can I just shut down my pc without pausing or cancelling or even exiting
HTTrack at all?