Ah, I meant: for the last 24 hours, several instances of the command line
version have been running.  I suppose for those specific instances there is no
way to pause them other than by hibernating the machine.

(If I were to close down the Internet connection, would they error out on the
not-yet-captured files in a reasonable time?)

Next time I may use the flags you suggested, or (probably) run the GUI version
again.

Thanks for thinking along!