[Map Module] Why my routes get deleted on upgrades

Just in case there is anybody else out there with a pea brain...

Well, I just figured out why my route(s) always end up being
deleted every time I upgrade... It is due to the way I go
about upgrading. I always mv my map directory (to save all of
the things I invariably have messed with) aside and unzip the
new version in the modules directory. I have learned that I
always need to change permissions on the map/images directory
-and- copy over my map/images/groups/* (uploaded group thumbs).
I did not realize that there is a map/images/routes directory
that I was not copying over... this was the reason for my
route(s), apparently, disappearing. Since this directory does
not appear to exist in a newly unzipped map/images directory,
I assume it gets created when the first route is created.