Something like sharing from your home is always risky. But there are safe things you can do. Get a second internet connection and then a good router like a nighthawk (because it has the ftp ability) and all you need is a USB hard drive enclosure with the hard drive no computer needed. Set up is easy just do it with a laptop and unhook it when your done. Leaving your home line safe and separating but having direct access is good way. There is more to it but that's pretty much it no software to add to your clients and a server with out having to buy a server.