-See also bf(--copy-dest) and bf(--link-dest).
-
-dit(bf(--copy-dest=DIR)) This option behaves like bf(--compare-dest), but
-rsync will also copy unchanged files found in em(DIR) to the destination
-directory (using the data in the em(DIR) for an efficient copy). This is
-useful for doing transfers to a new destination while leaving existing
-files intact, and then doing a flash-cutover when all files have been
-successfully transferred.
-
-If em(DIR) is a relative path, it is relative to the destination directory.
-See also bf(--compare-dest) and bf(--link-dest).