I noticed today at work that files I was adding to sync, rendered animation image files so quite a lot and quite large, was dissapearing from their folders. It looked like it was a laptop with not too much storage that was deleting the files. Sure enough, the laptop was filled to the brim, not a single Kb left. It had started to send deletions and replacement files of 0Kb size to my other machines... I pulled the plug on that one and don't want to turn it on before I find out what damage it did so I don't know what version of BTsync it ran, but it was older than the 1.4.103 I have on my work