Now that encrypted folders are part of BTsync, it would be great to have affordable options for setting up cloud peers. I'd love to see the option to connect to many of the various cloud storage services out their via their APIs. My personal favourite (due to cost) is B2. $5/month per TB is pretty hard to argue with. The challenge is getting my BTsync encrypted folder onto B2, a process that currently requires a separate VPS and some CLI magic. It would be great if there were a simple, built-in way to go about this.
Besides B2, there's Dropbox, Google, S3 etc. etc. etc. - many options open up once this functionality is available.
To hold off the naysayers... yes, you can spin up your own VPS or host a NAS somewhere. Those are great options. This adds to those options for something more redundant, affordable and geography-less.