If your cloud service doesn't support sync'ing out to something else as a primary use case and function, then I kind don't like your cloud service. Like, whatever document I am working on, I should be able to connect it to a git(hub) repo, or an S3 bucket, or whatever the heck, even just emailing myself .tgz copies daily - whatever. But otherwise you look like yet another jerky vendor trying to get user lock in, rather than giving me what I really want, what I really really want.