If you have to install softwares, security updates and fixes often in multiple systems in your local network, then having a local Ubuntu repository is an efficient way. Because all required packages are downloaded over the fast LAN connection from your local server, so that it will save your Internet bandwidth and reduces your annual cost of Internet. In this tutorial i will show you how to install local repository in Ubuntu 13.04 server in two methods. If you use external hdd then it will your portable repository. You can use it in multiple locations other than your LAN. Both are easy to install and configure, finally pick one of them for your requirement.