I have a portable hard-drive which has a data tree on it, and an
internal hard-drive with (theoretically) the same tree.  They _were_
identical at some point in the past.  I've lost track of what changes
I've made on which.

So, I'm thinking of running this pair of rsync's:

rsync -tru e:\data_tree d:\data_tree
rsync -tru d:\data_tree e:\data_tree

The theory being that if the internal drive has a more recent
date-stamp for a file, I don't want the external data over-writing it.
And then the second copies that more recent data back out to the
external drive.

Am I missing anything here?

-- 
Scott Raun
sraun at fireopal.org