Index: Mk/Scripts/do-fetch.sh
===================================================================
--- Mk/Scripts/do-fetch.sh
+++ Mk/Scripts/do-fetch.sh
@@ -144,6 +144,16 @@
 				if env -S "${dp_FETCH_ENV}" ${_fetch_cmd}; then
 					actual_size=$(stat -f %z "${file}")
 					if [ -n "${dp_DISABLE_SIZE}" ] || [ -z "${CKSIZE}" ] || [ "${actual_size}" -eq "${CKSIZE}" ]; then
+						if [ -n "${dp_DEVELOPER}" ]; then
+							if [ "${site}" = "${dp_MASTER_SITE_BACKUP}" -a ${sites_remaining} -eq 0 ]; then
+								${dp_ECHO_MSG} "===> /!\\ Warning /!\\"
+								${dp_ECHO_MSG}
+								${dp_ECHO_MSG} "     Fetched $file distfile from the backup MASTER_SITE."
+								${dp_ECHO_MSG} "     Please check availablity of primary MASTER_SITES"
+								${dp_ECHO_MSG} "     if this situation persist."
+								${dp_ECHO_MSG}
+							fi
+						fi
 						continue 2
 					else
 						${dp_ECHO_MSG} "=> Fetched file size mismatch (expected ${CKSIZE}, actual ${actual_size})"