apt-mirror binary package in Ubuntu Trusty amd64

 A small and efficient tool that lets you mirror a part of or
 the whole Debian GNU/Linux distribution or any other apt sources.
 .
 Main features:
  * It uses a config similar to apts <sources.list>
  * It's fully pool comply
  * It supports multithreaded downloading
  * It supports multiple architectures at the same time
  * It can automatically remove unneeded files
  * It works well on overloaded channel to internet
  * It never produces an inconsistent mirror including while mirroring
  * It works on all POSIX compliant systems with perl and wget

Source package