With the Games with Gold program, Gold members can download 2 games for free each month. Since I have an old Xbox 360 with a 120gb HDD, my harddisk is already full. I'm aware of the possibility to use 32gb usb-sicks to expand the storage, but right now I'm already using 6 of them to hold all the data (I don't delete old games or old dlc, and I don't want to in the future).
Please add Support für external HDDs!!! Or at least release a bigger HDD for older consoles (alltough I guess, that new concoles will reach their limits soon as well).