Update pibackup.sh

pibackup.sh

@@ -26,7 +26,7 @@ if [ "$1" != "update" ]; then
 		#mount.cifs ${ServerName} ${MountPoint} -o user=${UserName},password=${Password}
 				
 		until [ $c > 59 ]; do
-			if [ ! -f ${MountPoint}/mounted ]; then
+			if [ -f ${MountPoint}/mounted ]; then
 				echo "$(date) - Backup Drive mounted"
 				c=100
 			else