It took me a bit of trial and error to get this tool to do exactly what I wanted, so here are a few quick examples that hopefully will save you some time.

Updating the WBFS partition

Copy everything in the /source/path directory to the wbfs partition (auto detected) that doesn’t already exist on the wbfs partition.

# sudo wwt UPDATE -t /source/path/ --auto


UPDATE: Copy only new files
-t: Test mode, don't make any changes (until this flag is removed)
--auto: Auto detect the wbfs drive destination