Would love to get HN's thoughts on this idea ... if BTSync were to release (or have developed if it goes open source) a mobile SDK for ios and android, what if

Would love to get HN's thoughts on this idea ... if BTSync were to release (or have developed if it goes open source) a mobile SDK for ios and android, what if an app that used this would just give the user a folder secret. This secret could then be used to set up a folder on their PC to automatically get access to and backup data from their mobile devices. I for one would love this, because then I can choose how much infrastructure to devote to backing up and sharing (between my own applications) my mobile data.