--numeric-ids don't map uid/gid values by user/group name
--timeout=TIME set IO timeout in seconds
-I, --ignore-times don't exclude files that match length and time
+ --size-only only use file size when determining if a file should be transferred
-T --temp-dir=DIR create temporary files in directory DIR
--compare-dest=DIR also compare destination files relative to DIR
-z, --compress compress file data
already the same length and have the same time-stamp. This option turns
off this behavior.
+dit(bf(-I, --size-only)) Normally rsync will skip any files that are
+already the same length and have the same time-stamp. With the
+--size-only option files will be skipped if they have the same size,
+regardless of timestamp. This is useful when starting to use rsync
+after using another mirroring system which may not preserve timestamps
+exactly.
+
dit(bf(-c, --checksum)) This forces the sender to checksum all files using
a 128-bit MD4 checksum before transfer. The checksum is then
explicitly checked on the receiver and any files of the same name