I started using BTSync a few days ago and I must admit it is a very interesting and useful software. However there are a few things that bug me: [1] It uses a

I started using BTSync a few days ago and I must admit it is a very interesting and useful software. However there are a few things that bug me: [1] It uses a public tracker to transfer your files, which mean anyone with your secret phrase can download your files from the other end of the world. You can't assign a private tracker or change the current one. (The use of trackers can be turned off but when I did, it failed to sync, even within a LAN) [2] If a direct connection cannot be made, a relay will be used to transfer your files. (This is turned on by default but you can turn it off in the settings) [3] .SyncIgnore which is supposed to be similar to .gitignore does not work as expected. [4] "Anonymous" statistics are collected and cannot be opted out or turned off. [5] The claim for privacy, security and encryption cannot be easily audited since it is closed source. BTSync definitely fills the void what Dropbox leaves behind but I wouldn't recommend using it for anything secure.