resend will do a normal bf(--inplace) update to correct the mismatched data.
Only files on the receiving side that are shorter than the corresponding
file on the sending side (as well as new files) are sent.
-Implies bf(--inplace).
+Implies bf(--inplace), but does not conflict with bf(--sparse) (though the
+bf(--sparse) option will be auto-disabled if a resend of the already-existing
+data is required).
dit(bf(-d, --dirs)) Tell the sending side to include any directories that
are encountered. Unlike bf(--recursive), a directory's contents are not copied
instead it will just report the actions it would have taken.
dit(bf(-S, --sparse)) Try to handle sparse files efficiently so they take
-up less space on the destination.
+up less space on the destination. Conflicts with bf(--inplace) because it's
+not possible to overwrite data in a sparse fashion.
NOTE: Don't use this option when the destination is a Solaris "tmpfs"
filesystem. It doesn't seem to handle seeks over null regions