HELP! I'm really confused about how to stop this program.

When it reached the point where I wanted to stop it I clicked cancel and it
asked if I wanted to stop Winhttrack and I clicked "yes" and the 150 MiB I had
saved started going backwards as if it was deleting.

I have clicked pause in the menu under Mirror to stop it so I could get help
on this forum.

Before I started the download I had chosen "do not purge old files" under
Build in the options.  Where is the "do not delete" you are talking about.

Flashing at the top right now is "Finishing pending transfers" so I let it
finish but the saved bytes (150 MiB) were going backwards.  That's when I
paused it.

Last time I clicked "Select (Cancel) to stop now!" which is flashig too,
everything was deleted.  This is my second try.  What do I need to do so I
don't lose everything again?
Thanks!