[support] Drush changes permissions and overwrites htaccess

Drush is changing permissions on the target root (@stage) 755 to 750 and overwritting .htaccess (@stage) When I run drush rsync @dev @stage How can I prevent these two actions? As ever, I'm sure there is a documentation or discussion on these matters. I'm not clear from example.aliases.drushrc.php thanks -- Tim tim at tee jay forty nine dot com or akwebsoft dot com http://www.akwebsoft.com