This sounds really interesting and just what I was starting to look for.
What I'm not clear on and couldn't find info about is what's the storage size trade-off? Presumably you get these benefits by providing some of your storage to others, as they do for you. I'm trying to decide the size of disk I need to use and not clear how to estimate that. Also not clear how recovery is dealt with if my storage fails spectacularly. Can you restore from the "cloud" or do you still need to have your own full backups? The fact that links still work when you're offline makes it sound like cloud recovery is possible but didn't see anything about that.