How can i get always connection with my home network extern harddisk

[jessehup21]

I am searching for a method to get access to my extern hard disk wherever I am, so I can stream music and films. I think that the best way to do this is to connect my extern hard disk with my router (netgear) and find a way to get access to my router at any time. i have tried a ftp server but than i can't stream from my external hard disk.

I use Mac OS Lion and would like to use time machine.

Does some of you know a way to do this?
Thanks for your help and sorry for my english its not my first language.

Jesse