Windows – Can Robocopy be configured to only log the “errors”

Does this mean that it will run one time first and then keep running after it finishes and run again if a change happens somewhere down in the filestructure or when something have changed and a time has passed?

Yes. /MON counts number of files changed; /MOT counts time.

I've been afraid to ever try these options, since the docs say how to START these jobs, but not how to STOP them. They might become invisible, unstoppable scheduled tasks, for all I know.

This page indicates it runs until you interrupt the running job, e.g., with control-C.

(Added as an answer instead of as a comment, because StackExchange doesn't allow me to write comments without 50 reputation, and I have 1 reputation after 3 years.)

You must include the full path (including the drive) to the file to exclude. Relative paths won't work.

This works:

robocopy folder1 destination /E /XF "c:\somedir\another dir\folder1\help.txt"

This doesn't:

robocopy folder1 destination /E /XF "folder1\help.txt"

Nor does this:

robocopy folder1 destination /E /XF ".\folder1\help.txt"