According to my tests, the current setting `backtick 1 0 60' as well
as `backtick 1 60 60' work. Even when modifying screenrc within screen
and sourcing it again.

Only with `backtick 1 60 0' the output does not get refreshed.

So, afaics the setting *autorefresh* seems to be the important one here.

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P.S.: JFYI. I was using the attached script and `backtick 1 0 3
~/screen_trial' and it's aforementioned variants for testing. As well
as `touch /tmp/test' and `rm /tmp/test' within screen then.