Man, I typed a whole reply saying basically the same thing but you beat me to it! To expand a bit further, in this demo app, the "Save" button calls an API of a pinning service (Eternum), which pins the file on an external node so it will stay there as long as it's being paid for. Right now most pinning services require that you pay them to host your file, but the plan for IPFS is to use something like Filecoin to incentivize pinning. With Filecoin, instead of paying a single service to host your content, you would put out an order to the Filecoin network which says "anyone who hosts my file gets $x per GB per second", along with some settings (e.g. I want minimum 5x copies of my file on the network). Then, anyone hosting a Filecoin node will automatically fulfill requests by hosting content in exchange for a cryptocurrency payout. So, instead of a single hosting service, you are paying the entire network to automatically host your file in many places at once.