dit(bf(--ignore-errors)) Tells --delete to go ahead and delete files
even when there are IO errors.
-dit(bf(--force)) This option tells rsync to delete directories
-when non-directories (for example symlinks or plain files) take their
-place even if the deleted directories are not empty. This applies to both
-the --delete option and to cases where rsync tries to copy a normal file
-but the destination contains a directory of the same name.
+dit(bf(--force)) This options tells rsync to delete directories even if
+they are not empty when they are to be replaced by non-directories. This
+is only relevant without --delete because deletions are now done depth-first.
+Requires the --recursive option (which is implied by -a) to have any effect.
dit(bf(-B , --block-size=BLOCKSIZE)) This controls the block size used in
the rsync algorithm. See the technical report for details.