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rsync has:

--max-size=SIZE         don't transfer any file larger than SIZE

Does unison have a similar option?

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You could use the -copythreshold option. From the unison help flag:

-copythreshold n   use copyprog on files bigger than this (if >=0, in Kb)

You could make a dummy program/script that does nothing. Usually I believe that you would specify rsync with special options as the copyprog, but if you don't want to copy anything, the copyprog should take no action.

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