I regularly use dump(8) with snapshots to back up my server.

While this seems to have been working perfectly well so far,
upon (re)reading the man page for dump(8), I have noticed a
somewhat scary pair of lines in the paragraph describing
the option for -C <cachesize> (emphasis with stars mine):

        [Use of this option] will greatly improve performance
        at the cost of ***dump possibly not noticing changes in
        the file system*** between passes.

        ***It is recommended that you always use this option when
        dumping a snapshot.***

Does anyone know what, exactly, this means?

no, in my experience it's no difference in speed with this enabled or not.
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