can only even values, then rsync will re-transfer too many files. You can
avoid this by specifying the --modify-window=1 option.
+<p>A third case happens can happen when daylight-savings time changes if
+your OS+filesystem saves file times in local time instead of UTC. For a
+full explanation of this and some suggestions on how to avoid them problem,
+see <a href="daylight-savings.html">this
+document</a>.
+
<p>If you think that rsync is erroneously copying every file then look at
the stats produced with -v and see if rsync is really sending all the data.
See also the --checksum (-c) option for one way to avoid the extra copying