Well... no. If you have a big file and change just a few bytes the sync done by the Dropbox client is very fast (win/mac). In the example given, a TC file, the size never changes, the timestamp is reseted and still the Dropbox client keeps the changed bytes and only them synced. Even a conflict file (a complete new copy of some version) is created very fast, no full transmission involved. That sad, I wouldn't expect a mobile app to do all that. It would be awesome, but probably not possible. LARelogio