Try this to re-package your backup:
tar -cvzf cocos2d-forum-2015-05-01-041307.tar.gz -C cocos2d-forum-2015-05-01-041307 .
Try this to re-package your backup:
tar -cvzf cocos2d-forum-2015-05-01-041307.tar.gz -C cocos2d-forum-2015-05-01-041307 .